| Antrim Enterprise Agency | Business Centre | Antrim Enterprise Agency, 58 Greystone Rd, Antrim BT41 1JZ | http://www.antrimenterprise.com/ | +44 28 9446 7774 | Antrim | | BT41 1JZ |
| Antrim Housing Executive Office | District office; Property management company | Antrim Housing Executive Office, 55 High St, Antrim BT41 4AY | http://www.nihe.gov.uk/ | +44 344 892 0900 | Antrim | | BT41 4AY |
| Antrim Jobs & Benefits Office | Job Centre; Employment Centre | Antrim Jobs & Benefits Office, 20 Castle St, Antrim BT41 4JE | https://www.nidirect.gov.uk/contacts/antrim-jobs-benefits-office | +44 300 200 7822 | Antrim | | BT41 4JE |
| Its Worth a Punt LTD | Corporate office | 29a, Its Worth a Punt LTD, Co, 31 Market Square, Lisburn, Antrim BT28 1AD | http://itsworthapunt.co.uk/ | | Antrim | Lisburn | BT28 1AD |
| Antrim Borough Council | Council | Antrim Borough Council, Steeple Gardens, 2, Steeple Rd, Antrim BT41 1BW | https://antrimandnewtownabbey.gov.uk/ | +44 300 123 4568 | Antrim | | BT41 1BW |
| Antrim Civic Centre | Civic Centre | Antrim Civic Centre, Civic Centre, 50 Stiles Way, Antrim BT41 2UB | https://antrimandnewtownabbey.gov.uk/ | +44 300 123 4568 | Antrim | | BT41 2UB |
| Education Authority Antrim Board Centre | Board of education; Primary school | Education Authority Antrim Board Centre, 17 Lough Rd, Antrim BT41 4DH | http://www.eani.org.uk/ | +44 28 9448 2200 | Antrim | | BT41 4DH |
| Contact Marketing Ltd | Marketing agency | Contact Marketing Ltd, 29 Magherabeg Rd, Randalstown, Antrim BT41 2PL | http://www.contactmarketing.co.uk/ | +44 28 9447 3840 | Antrim | Randalstown | BT41 2PL |
| Antrim Construction Company Limited | Property Developer | Antrim Construction Company Limited, Ladyhill House, 130-134 High St, Holywood BT18 9HW | http://www.antrimconstruction.net/ | +44 28 9042 8661 | Holywood | | BT18 9HW |
| NIHE Antrim Area Office | Association / Organization | NIHE Antrim Area Office, 55 High St, Antrim BT41 4BN | | | Antrim | | BT41 4BN |
| Threshold Administration Office | Corporate office | Threshold Administration Office, 432 Antrim Rd, Belfast BT15 5GB | https://www.threshold-services.co.uk/ | +44 28 9087 1313 | Belfast | | BT15 5GB |
| Karl Serviced Offices | Office rental agency | Karl Serviced Offices, 92 Old Ballyrobin Rd, Muckamore, Antrim BT41 4TJ | http://www.karlgroup.co.uk/ | +44 28 9442 5600 | Antrim | Muckamore | BT41 4TJ |
| Antrim Delivery Office | Shipping and postal service | Antrim Delivery Office, Royal Mail, Delivery Office, Newpark Industrial Estate, 10 Orchard Way, Antrim BT41 2RU | https://www.royalmail.com/services-near-you/delivery-office/antrim-delivery-office-bt41-2ru | +44 345 774 0740 | Antrim | | BT41 2RU |
| Killymeal House | Corporate office | Killymeal House, Belfast BT7 2JD | | | Belfast | | |
| City Quays 1 | Corporate office | City Quays 1, 7 Clarendon Rd, Belfast BT1 3YD | https://www.belfast-harbour.co.uk/cityquays | +44 28 9031 5738 | Belfast | | BT1 3YD |
| Urban HQ | Office rental agency | Urban HQ, Eagle Star House, 5-7 Upper Queen St, Belfast BT1 6FB | https://urban-hq.co.uk/ | +44 28 9045 0850 | Belfast | Belfast | BT1 6FB |
| Bazaarvoice Belfast | Corporate office | Bazaarvoice Belfast, 8 Lanyon Pl, Belfast BT1 3LP | https://www.bazaarvoice.com/ | | Belfast | | BT1 3LP |
| Queens House | Corporate office | Queens House, 14 Queen St, Belfast BT1 6ED | | +44 28 9031 1575 | Belfast | | BT1 6ED |
| Belfast City Office - Elmwood Avenue | Office rental agency; Telephone answering service; Virtual office rental | Belfast City Office - Elmwood Avenue, 54 Elmwood Ave, Belfast BT9 6AZ | http://www.belfastcityoffice.com/ | +44 28 9066 0000 | Belfast | | BT9 6AZ |
| HM Passport Office, Belfast [Appointments only] | Passport office | HM Passport Office, Belfast [Appointments only], Law Society House, 90-106 Victoria St, Belfast BT1 3GN | https://www.gov.uk/government/organisations/hm-passport-office | +44 300 222 0000 | Belfast | | BT1 3GN |
| Glandore Arthur House Belfast | Private Office Space Belfast | Office rental agency; Business Centre; Conference Centre; Co-working Space; Events Venue; Virtual office rental | Glandore Arthur House Belfast | Private Office Space Belfast, Arthur House, 41 Arthur St, Belfast BT1 4GB | https://glandore.co/location/arthur-house/?utm_source=mybusiness&utm_medium=organic | +44 28 9044 7100 | Belfast | | BT1 4GB |
| Clear Channel Northern Ireland | Corporate office | Clear Channel Northern Ireland, Belfast BT3 9AD | http://clearchannel-ni.co.uk/ | +44 28 9046 3250 | Belfast | | |
| Belfast City Centre Management Company | Non-profit organisation | 2, Belfast City Centre Management Company, Sinclair House, 95 – 101 Royal Ave, Belfast BT1 1FE | https://www.belfastcentre.com/ | +44 28 9024 2111 | Belfast | | BT1 1FE |
| City Exchange | Corporate office | City Exchange, Gloucester St, Belfast BT1 4LS | | | Belfast | | BT1 4LS |
| Cash Clicks | Corporate office | Cash Clicks, Co, 157-173 Roden St, Belfast, Antrim BT12 5QA | http://cashclicks.co.in/ | | Antrim | Belfast | BT12 5QA |
| CCEA | Corporate office | CCEA, 29 Clarendon Rd, Belfast BT1 3BG | http://ccea.org.uk/ | +44 28 9026 1200 | Belfast | | BT1 3BG |
| The Metro Building/Northern Ireland Civil Service | Corporate office | The Metro Building/Northern Ireland Civil Service, 9 Donegall Square S, Belfast BT1 5JA | | | Belfast | | BT1 5JA |
| BMA | Corporate office | BMA, Eagle Star House, 5-7 Upper Queen St, Belfast BT1 6FB | http://www.bma.org.uk/ | | Belfast | | BT1 6FB |
| Northern Ireland Railways Company Limited | Transportation service | Northern Ireland Railways Company Limited, 22 Great Victoria St, Belfast BT2 7BA | | | Belfast | | BT2 7BA |
| CME Technology and Support Services Ltd. | Corporate office | CME Technology and Support Services Ltd., 25 Great Victoria St, Belfast BT2 7AQ | http://www.cmegroup.com/ | +44 28 9089 6600 | Belfast | | BT2 7AQ |
| PricewaterhouseCoopers Belfast | Business management consultant | PricewaterhouseCoopers Belfast, 20 Wellington Pl, Belfast BT1 6GE | https://www.pwc.co.uk/who-we-are/office-locations.html#/offices/office-belfast | +44 28 9024 5454 | Belfast | | BT1 6GE |
| Belfast Harbour Commissioners Harbour Office | Port authority; City government office | Belfast Harbour Commissioners Harbour Office, Harbour Office, Corporation Square, Belfast BT1 3AL | http://www.belfast-harbour.co.uk/ | +44 28 9055 4422 | Belfast | | BT1 3AL |
| Belfast One | Corporate office | Belfast One, Scottish Provident Building, Donegall Square W, Belfast BT1 6JH | http://belfastone.co.uk/ | +44 28 9521 6956 | Belfast | | BT1 6JH |
| Custom House - Serviced Offices | Office rental agency; Business Centre; Business-to-Business service; Events Venue; Executive suite rental agency | Custom House - Serviced Offices, Custom House Square, Belfast BT1 3ET | https://customhousebelfast.com/ | +44 28 9621 2500 | Belfast | | BT1 3ET |
| Waterfront Plaza | Corporate office | Waterfront Plaza, 8 Laganbank Rd, Belfast BT1 3EL | | | Belfast | | |
| Met Office Belfast | Corporate office | Met Office Belfast, 34 British Rd, Aldergrove, Crumlin BT29 4DJ | http://www.metoffice.gov.uk/ | +44 370 900 0100 | Crumlin | Aldergrove | BT29 4DJ |
| OCS UK & Ireland - Belfast | Corporate office | Unit C, Building 3, OCS UK & Ireland - Belfast, 10 Heron Rd, Belfast BT3 9LE | https://ocs.com/uk/ | | Belfast | | BT3 9LE |
| BBC Headquarters | Corporate office | BBC Headquarters, 17 Heron Rd, Belfast BT3 9LE | | | Belfast | | BT3 9LE |
| Utility Regulator | Corporate office | Utility Regulator, Queens House, 14 Queen St, Belfast BT1 6ED | http://www.uregni.gov.uk/ | +44 28 9031 1575 | Belfast | | BT1 6ED |
| Electoral Office for Northern Ireland | Government office | Electoral Office for Northern Ireland, 15 Church St, Belfast BT1 1ER | http://www.eoni.org.uk/ | +44 28 9044 6680 | Belfast | | BT1 1ER |
| Car Park Services Limited | Corporate office | Car Park Services Limited, 36 Great Patrick St, Belfast BT1 2LT | https://www.carparkservices.com/ | +44 28 9023 0767 | Belfast | | BT1 2LT |
| North City Business Centre | Business Centre; Property management company; Training consultant | North City Business Centre, 2 Duncairn Gardens, Belfast BT15 2GG | http://www.north-city.co.uk/ | +44 28 9074 7470 | Belfast | | BT15 2GG |
| Inishkeen House | Corporate office | Inishkeen House, Killyhevlin Industrial Estate, Killyhevlin, Enniskillen BT74 | http://www.daera-ni.gov.uk/ | +44 300 200 7840 | Enniskillen | Killyhevlin | BT74 |
| Invest Northern Ireland | Economic development agency | Invest Northern Ireland, Bedford Square, 1 Bedford St, Belfast BT2 7ES | https://www.investni.com/ | +44 800 181 4422 | Belfast | | BT2 7ES |
| Ni-co | Business management consultant | Landmark House, Ni-co, 5 Cromac Pl, Belfast BT7 2JD | http://www.nico.org.uk/ | +44 28 9034 7750 | Belfast | | BT7 2JD |
| Neo Miners | Corporate office; Service establishment | | | +44 7520 641035 | | | |
| N I Direct Government Services | Government office | N I Direct Government Services, Telephone House, 45-75 May Street, Belfast BT1 4NB | https://www.nidirect.gov.uk/ | +44 300 200 7898 | Belfast | | BT1 4NB |
| Department for Communities | Government office | Department for Communities, Causeway Exchange, 1-7 Bedford St, Belfast BT2 7EG | https://www.communities-ni.gov.uk/ | +44 28 9025 8825 | Belfast | | BT2 7EG |
| Thrive OBM & VA Services | Corporate office; Service establishment | | http://thriveobm.com/ | | | | |
| Glandore Arthur Place | Private Office Space Belfast | Office rental agency; Business Centre; Conference Centre; Co-working Space; Events Venue; Virtual office rental | Glandore Arthur Place | Private Office Space Belfast, 24-26 Arthur Pl, Arthur St, Belfast BT1 4GF | https://glandore.co/location/arthur-place/?utm_source=mybusiness&utm_medium=organic | +44 28 9044 7100 | Belfast | | BT1 4GF |
| The Hatchery NI | Co-working Space; Park and Garden | The Hatchery NI, 58 Greystone Rd, Antrim BT41 1JZ | | +44 28 9446 7774 | Antrim | | BT41 1JZ |
| Leading Governance Limited | Corporate office; Business-to-Business service; Service establishment | | http://www.leadinggovernance.com/ | +44 7967 085561 | | | |
| Northern Ireland Assembly | Regional government office; Historical landmark; Tourist attraction | Northern Ireland Assembly, Parliament Buildings, Ballymiscaw, Stormont, Belfast BT4 3XX | http://www.niassembly.gov.uk/ | +44 28 9052 1137 | Belfast | | BT4 3XX |
| Corporate Telecom Ltd | Telecommunications service provider | 1B, Corporate Telecom Ltd, Montgomery House, Castlereagh Business Park, 478 Castlereagh Rd, Belfast BT5 6BQ | https://www.corporatetelecom.biz/ | +44 28 9079 4800 | Belfast | | BT5 6BQ |
| Portview Trade Centre | Business Park | Portview Trade Centre, 310 Newtownards Rd, Belfast BT4 1HE | http://www.portviewtradecentre.com/ | +44 28 9045 3260 | Belfast | | BT4 1HE |
| Ordnance Survey Northern Ireland | Government office | Ordnance Survey Northern Ireland, Lanyon Pl, Belfast BT1 3LP | https://www.nidirect.gov.uk/campaigns/ordnance-survey-of-northern-ireland | +44 300 200 7804 | Belfast | | BT1 3LP |
| HQ2 Virtual Offices | Virtual office rental | HQ2 Virtual Offices, 98 Lisburn Rd, Belfast BT9 6AG | | +44 28 9066 5488 | Belfast | | BT9 6AG |
| IoD Northern Ireland | Business Centre | IoD Northern Ireland, Innovation Factory, Forthriver Business Park, 385 Springfield Rd, Belfast BT12 7DG | https://www.iod.com/locations/northern-ireland/ | +44 28 9694 6740 | Belfast | | BT12 7DG |
| Titanic Quarter Limited | Business Park; Tourist attraction | Titanic Quarter Limited, Titanic House, 6 Queens Rd, Belfast BT3 9DT | http://www.titanicquarter.com/ | +44 28 9076 6300 | Belfast | | BT3 9DT |
| The Ewart | Corporate office | The Ewart, 3 Bedford St, Belfast BT2 7EP | https://theewartbelfast.com/ | +44 28 9013 9880 | Belfast | | BT2 7EP |
| Glenbrook Stud Head Office | Corporate office | Glenbrook Stud Head Office, 58 Moneymore Rd, Magherafelt BT45 6HG | | | Magherafelt | | BT45 6HG |
| Wellington Park Business Centre | Business Centre; Business administration service; Business park; Business-to-Business service; Conference Centre; Office rental agency; Telephone answering service; Virtual office rental | Wellington Park Business Centre, 3 Wellington Park, Belfast BT9 6DJ | http://www.thewellingtonpark.com/ | +44 28 9092 3333 | Belfast | | BT9 6DJ |
| Virtual Office Belfast - Virtual HQ | Virtual office rental | Virtual Office Belfast - Virtual HQ, 19 Arthur St, Belfast BT1 4GA | https://www.virtual-headquarters.com/locations/belfast/?utm_source=google&utm_medium=organic&utm_campaign=gbp_listing&utm_content=arthurstreet_belfast | +44 28 9600 9231 | Belfast | | BT1 4GA |
| Remote Office Services NI | Business administration service; Betting agency; Business management consultant; Consultant | Remote Office Services NI, Princeton Ave, Lurgan, Craigavon BT66 8LN | http://www.remoteofficeservicesni.co.uk/ | +44 7710 048444 | Craigavon | Lurgan | BT66 8LN |
| City Quays 2 | Corporate office | City Quays 2, 7 Clarendon Rd, Belfast BT1 3BG | https://www.belfast-harbour.co.uk/cityquays/cq-offices/cq2-offices | +44 28 9027 8761 | Belfast | | BT1 3BG |
| Ofcom Northern Ireland | Government office | Landmark House, Ofcom Northern Ireland, The Gasworks, 5 Cromac Quay, Belfast BT7 2JD | http://www.ofcom.org.uk/ | +44 28 9041 7500 | Belfast | | BT7 2JD |
| Allstate NI Offices | Business Centre | Allstate NI Offices, Catalyst, Bay Rd, Londonderry BT48 7SH | | +44 28 9067 8000 | Londonderry | | BT48 7SH |
| Teleperformance UK Ltd | Corporate office | Teleperformance UK Ltd, Clandeboye Retail Park, W Circular Rd, Bangor BT19 1AR | https://teleperformanceukcareers.co.uk/ | +44 28 9147 4500 | Bangor | | BT19 1AR |
| Head Office | Hairdresser | Head Office, Queensway, Carryduff, Belfast BT8 8NX | | +44 28 9081 5987 | Belfast | Carryduff | BT8 8NX |
| Unit 1 | Corporate office | Unit 1, 1 Belfast Road Muckamore, Muckamore, Antrim BT41 1QS | | | Antrim | Muckamore, Antrim | BT41 1QS |
| Information Commissioner’s Office | Government office | Information Commissioner’s Office, Belfast BT7 2JB | | | Belfast | Belfast | |
| Allstate Northern Ireland | Software company; IT security service; IT support and services | Allstate Northern Ireland, 10 Mays Mdw, Belfast BT1 3PH | https://www.allstate.com/northern-ireland.aspx | +44 28 9067 8000 | Belfast | | BT1 3PH |
| ITNI LTD | Corporate office | ITNI LTD, Sketrick House, Jubilee Rd, Newtownards BT23 4YH | | | Newtownards | | BT23 4YH |
| Northern Ireland Government Affairs Group | Government office | Unit A8, Northern Ireland Government Affairs Group, Dundonald Enterprise Park, Carrowreagh Rd, Dundonald, Belfast BT16 1QT | | | Belfast | Dundonald | BT16 1QT |
| Northern Ireland Housing Excecutive | Corporate office | Northern Ireland Housing Excecutive, Court St, Newtownards BT23 7NX | | | Newtownards | | BT23 7NX |
| Government Of Northern Ireland Ltd | Government office | Government Of Northern Ireland Ltd, 21 Church St, Bushmills BT57 8QJ | | +44 300 200 7860 | Bushmills | | BT57 8QJ |
| Northern Ireland Chamber of Commerce and Industry | Chamber of commerce | Northern Ireland Chamber of Commerce and Industry, 40 Linenhall St, Belfast BT2 8BA | http://www.northernirelandchamber.com/ | +44 28 9024 4113 | Belfast | | BT2 8BA |
| Locksley Business Park | Business park | Locksley Business Park, 7a, 39 Montgomery Rd, Belfast BT6 9UP | | | Belfast | Castlereagh | BT6 9UP |
| Companies House Belfast Office | Government office; Service establishment | | https://www.gov.uk/companies-house | | | | |
| RCP Northern Ireland Regional Office | Corporate office | RCP Northern Ireland Regional Office, 274 Grosvenor Rd, Belfast BT12 6BA | | +44 28 9063 4982 | Belfast | | BT12 6BA |
| Northern Ireland Office | Corporate office | Northern Ireland Office, 20-32 Chichester St, Belfast BT1 4GF | http://www.gov.uk/nio | +44 28 9052 0700 | Belfast | | BT1 4GF |
| Citigroup | Corporate office | Citigroup, 60 Sydenham Rd, Belfast BT3 9DP | http://www.citigroup.com/citi/ | +44 28 9040 9747 | Belfast | | BT3 9DP |
| BT Building Belfast | Corporate office | BT Building Belfast, 5 Lanyon Pl, Belfast BT1 3BT | | +44 28 9021 6161 | Belfast | | BT1 3BT |
| CYTI Ltd | Corporate office | House, 25, CYTI Ltd, 4th Floor Moneda, 27 Wellington Pl, Belfast BT1 6GD | | +44 800 111 6769 | Belfast | | BT1 6GD |
| Breedon Ireland, Mallusk - Northern Regional Office | Corporate office; Quarry | Breedon Ireland, Mallusk - Northern Regional Office, 5 Blackwater Rd, Newtownabbey BT36 4TZ | https://whitemountain.breedongroup.com/ | +44 28 9250 1000 | Newtownabbey | | BT36 4TZ |
| Northern Ireland | | Northern Ireland | | | | | |
| Electoral Office Headquarters | Corporate office | Electoral Office Headquarters, Electoral Office Headquarters St Anne's House, 15 Church St, Belfast BT1 1ER | https://www.reddit.com/r/android_beta/comments/1d30bd5/5_min_survey_tells_us_what_you_think_about/?utm_source=share&utm_medium=mweb3x&utm_name=mweb3xcss&utm_term=1&utm_content=share_button | +44 7494 912160 | Belfast | | BT1 1ER |
| Companies Registry Northern Ireland | Council | Companies Registry Northern Ireland, Waterfront Plaza, 8 Laganbank Rd, Belfast BT1 3BS | | | Belfast | | BT1 3BS |
| Bedford House | Corporate office | Bedford House, 16 - 22 Bedford St, Belfast BT2 7FD | http://www.bedford-house.com/ | | Belfast | | BT2 7FD |
| Merchant Square | Corporate office | Merchant Square, 20 Wellington Pl, Belfast BT1 6GE | | | Belfast | | BT1 6GE |
| Northern Ireland Statistics & Research Agency | Research institute; Civil registry | Northern Ireland Statistics & Research Agency, Colby House, Stranmillis Ct, Belfast BT9 5BF | http://www.nisra.gov.uk/ | +44 300 200 7836 | Belfast | | BT9 5BF |
| nibusinessinfo.co.uk | Business development service | nibusinessinfo.co.uk, 1 Bedford St, Belfast BT2 7ES | https://www.nibusinessinfo.co.uk/ | +44 800 181 4422 | Belfast | | BT2 7ES |
| National Trust Northern Ireland Regional Office | Corporate office | National Trust Northern Ireland Regional Office, Rowallane Stableyard, Saintfield, Ballynahinch BT24 7LH | https://www.nationaltrust.org.uk/visit/northern-ireland/rowallane-garden | +44 28 9751 0721 | Ballynahinch | Saintfield | BT24 7LH |
| Northern Ireland Transport Holding Co | Holding company | Northern Ireland Transport Holding Co, Chamber of Commerce House, 22 Great Victoria St, Belfast BT2 7LX | https://www.infrastructure-ni.gov.uk/articles/northern-ireland-transport-holding-company | +44 28 9024 3456 | Belfast | | BT2 7LX |
| Scottish Provident Building | Office rental agency; Business Centre; Executive suite rental agency; Virtual office rental | Scottish Provident Building, 7 Donegall Square W, Belfast BT1 6JH | https://www.venyou.co.uk/scottish-provident-building | +44 28 9091 8500 | Belfast | | BT1 6JH |
| Icon Offices - Belfast - Northern Ireland | Virtual office rental | Icon Offices - Belfast - Northern Ireland, 100 Lisburn Rd, Belfast BT9 6BT | https://iconoffices.co.uk/cheap-virtual-office-and-address-belfast-northern-ireland.php | +44 28 9099 0339 | Belfast | | BT9 6BT |
| Kilco International | Corporate office; Pet food and animal feeds | Kilco International, 1A Trench Rd, Mallusk, Newtownabbey BT36 4TY | http://kilco.co.uk/ | +44 1576 205480 | Newtownabbey | Mallusk | BT36 4TY |
| City Quays 3 | Corporate office | City Quays 3, Belfast BT1 3FE | | | Belfast | | BT1 3FE |
| Warner Bros. Discovery • Entertainment UK | Corporate office; Film production company | Warner House, Warner Bros. Discovery • Entertainment UK, 98 Theobalds Rd, London WC1X 8WB | https://www.wbd.com/ | +44 20 7984 5000 | London | | WC1X 8WB |
| Ryman Limited | Corporate office | Ryman Limited, Savoy Rd, Crewe CW1 6NA | | | Crewe | | CW1 6NA |
