- A la Ronde - Exmouth
- A World in Miniature Museum - Houghton, Carlisle
- Abbey Dore Court Garden - Nr Hereford
- Abbey House Museum - Kirkstall, Leeds
- Abbey Pumping Station - Leicester
- Abbeydale Industrial Hamlet - Sheffield
- Abbotsbury Children’s Farm - Abbotsbury, Nr Weymouth
- Abbotsbury Swannery - Abbotsbury, Nr Weymouth
- Aberconwy House - Conwy
- Aberdeen Maritime Museum - Aberdeen
- Aberdeunant - Taliaris, Llandeilo, Carmarthenshire
- Abingdon County Hall Museum - Abingdon, Oxon
- Abington Park Museum - Northampton
- Ackers Adventure - Sparkbrook, Birmingham
- Acorn Bank - Temple Sowerby, near Penrith
- Acorn Farm - Kirkby, Liverpool
- Active Kid Adventure Park - Stanley, Perthshire
- Activity World - Peterborough
- Acton Burnell Castle - Acton Burnell, Shrewsbury
- Acton Scott Historic Working Farm - Acton Scott, Church Stretton
- Adventure Castle - Hoddesdon
- Adventure Island - Southend-on-Sea
- Adventure Island Mini Golf - Birmingham
- Adventure Island Play Park - Lowestoft
- Adventure Valley - Durham
- Adventure Wonderland - Hurn, Christchurch
- Adventurelands - Newcastle upon Tyne
- Aerial Extreme Manchester - Manchester
- Aerial Extreme Milton Keynes - Milton Keynes
- Africa Alive! - Kessingland, Lowestoft
- Agricultural Museum Brook - Brook, Ashford
- AJ’z Activity Centre - Taunton
- Aldenham Country Park - Elstree
- Aldershot Military Museum - Aldershot
- Alford Manor House - Alford
- Alfriston Clergy House - Alfriston, Polegate
- All Things Wild Nature Centre - Evesham
- Allan Bank and Grasmere - Ambleside
- Allen Banks and Staward Gorge - Hexham
- Allhallows Museum of Lace and Local Antiquities - Honiton
- Almond Valley Heritage Centre - Millfield, Livingston, West Lothian
- Almonry Museum and Heritage Centre - Evesham
- Alnwick Castle - Alnwick
- Alpamare Scarborough Waterpark - Scarborough
- Althorp - Northampton
- Alton Towers - Alton
- Alvar Karting and Laser Centre - Willenhall
- Amazon World Zoo Park - Nr Arreton, Isle of Wight
- Amazonia Strathclyde Country Park - Motherwell
- Amberley Museum and Heritage Centre - Arundel
- Ambleside Roman Fort - Ambleside, Cumbria
- Amersham Museum - Old Amersham
- Amners Miniature Railway - Burghfield, Reading
- Anchors Away Play Manchester
- Ancient House Museum of Thetford Life - Thetford
- Anderton Boat Lift - Anderton, Northwich
- Anglers Country Park - Wintersett, Wakefield
- Anglesey Abbey, Gardens and Lode Mill - Lode, Cambridge
- Anglesey Model Village - Newborough, Anglesey
- Anglesey Sea Zoo - Brynsienicyn, Lanfairpwll, Isle of Anglesey
- Animal Farm Family Theme Park - Berrow
- Animal Quackers - Bacup
- Animalarium - Borth, Ceredigion
- Anne of Cleves House - Lewes
- Another World Adventure Centre - Halifax
- Anson Engine Museum - Poynton
- Antony - Torpoint
- Antz in Your Pantz - Timperley
- Apple Jacks Adventure Park - Warrington
- Appuldurcombe House Wroxall, Ventnor
- Apsley House - London
- Arbeia Roman Fort and Museum - South Shields
- Arctic Corsair - Hull
- Arley Arboretum - Upper Arley, near Bewdley
- Arlington Court and the National Trust Carriage Museum - Arlington, near Barnstaple
- Armitt Museum and Library - Ambleside, Cumbria
- Arne RSPB Reserve - Arne, Wareham
- ArtfulPots - Great Ellingham
- Arundel Castle - Arundel
- Ascott House and Garden - Wing, Leighton Buzzard
- Ash End House Children’s Farm - Middleton, Nr. Tamworth
- Ashby de la Zouch Castle - Ashby de la Zouch
- Ashby De La Zouch Museum - Ashby-de-la-Zouch
- Ashdown House - Lambourn, Newbury
- Ashford Borough Museum - Ashford
- Ashmolean Museum - Oxford, Oxfordshire
- Ashridge Estate - Berkhamsted
- Aston Hall - Aston, Birmingham
- Aston Springs Farm - Aston, Rotherham
- At-Bristol - Bristol
- Atholl Country Life Museum - Blair Atholl, Pitlochry, Perthshire
- Attenborough Nature Centre - Attenborough, Nottingham
- Attingham Park - Shrewsbury
- Atwell-Wilson Motor Museum - Calne
- Auchingarrich Wildlife Centre - Comrie, Perthshire
- Auckland Castle - Bishop Auckland
- Audley End House and Gardens - Saffron Walden
- Audley End Miniature Railway - Saffron Walden
- Avington Park - Winchester
- Avon Valley Adventure and Wildlife Park - Keynsham, Bristol
- Avoncroft Museum - Stoke Heath, Bromsgrove
- Aydon Castle - Corbidge
- Ayscoughfee Hall Museum - Spalding
- Aztec Soft Play - Carlisle
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