| Title | Initials (identifier) | County |
| Tavistock Astronomical Society | TaAS | Devon |
| Thanet Astronomy Group | TAG | Kent |
| The Baker Street Irregular Astronomers | BSIA | County of London |
| The Hampstead Scientific Society | HSS | County of London |
| The Spaceguard Centre | TSC | Cardiganshire |
| Theydon Bois AstroKyds | TBAK | Essex |
| Thurrock Astronomical Society | ThAS | Essex |
| Tiverton and Mid Devon Astronomy Society | TMDAS | Devon |
| Tolcarn Astronomy Club | TAC | Cornwall |
| Torbay Astronomical Society | ToAS | Devon |
| Tweeddale Astronomical Society | TwAS | Peebleshire |
| UK Astronomy | UKA | Buckinghamshire |
| Ulster Astronomical Society | UlAS | Ulster |
| University of Birmingham Astronomical Society | UBAS | Warwickshire |
| Usk Astronomical Society | UAS | Monmouthshire |
| Vectis Astronomical Society | VAS | Isle of Wight |
| Wadhurst Astronomical Society | WadAS | Sussex |
| Wakefield And District Astronomical Society | WaDAS | Yorkshire: West Riding |
| Walsall Astronomical Society | WalAS | Staffordshire |
| Walton Astronomy Group | WAG | Surrey |
| Warminster Astronomy Club | WAC | Wiltshire |
| Warwickshire Astronomical Society | WAS | Warwickshire |
| Wealden Astronomers | WeA | Sussex |
| Wells and Mendip Astronomers | WMA | Somerset |
| Wessex Astronomical Society | WeAS | Dorset |
| West Cornwall Astronomical Society | WCAS | Cornwall |
| West Didsbury Astronomical Society | WeDAS | Lancashire |
| West Kintyre Stargazers | WKS | Argyllshire |
| West of London Astronomical Society | WLAS | Middlesex |
| West Wales Astronomy Group | WWAG | Pembrokeshire |
| West Yorkshire Astronomical Society | WYAS | Yorkshire: West Riding |
| Weymouth Astronomy Club | WeAC | Dorset |
| Whitby & District Astronomical Society | WDAS | Yorkshire: North Riding |
| White Peak Astro. Obs. Group | WPAOG | Derbyshire |
| Whittington Astronomical Society | WhAS | Shropshire |
| Wigtownshire Astronomical Society | WiAS | Wigtownshire |
| William Herschel Society | WHS | Somerset |
| Wiltshire Astronomical Society | WiAS | Wiltshire |
| Wolverhampton Astronomical Society | WolAS | Staffordshire |
| Worcester Astronomical Society | WorcAS | Worcestershire |
| Worthing Astronomers | WA | Sussex |
| Worthing Astronomical Society | WortAS | Sussex |
| Wycombe Astronomical Society | WyAS | Buckinghamshire |
| Wythenshawe Park Stargazers Club | WPAS | Lancashire |
| York Astronomical Society, The | YAS | Yorkshire: North Riding |
Society for the History of Astronomy
shedding light on the history of astronomy
