| Tweenhills Observatory | Hartpury | — |
 UCL Observatory | Municipio de Barnet | — |
 University of Reading Atmospheric Observatory | Earley | — |
| Walney Bird Observatory | — | — |
| Wast Hills Observatory | — | — |
| Waterlooville observatory | Waterlooville | — |
| Werrington observatory | City of Peterborough | — |
| West Challow observatory | Wantage | — |
| Weybourne Atmospheric Observatory | Weybourne | — |
 Wigglesworth Observatory | — | — |
| Wilfred Hall Observatory | Ciudad de Preston | — |
| Willow Bank Observatory | Todmorden | — |
| Wimborne Minster observatory | Wimborne Minster | — |
| Woolston Observatory | North Cadbury | — |
| Wyncroft observatory | Attleborough | — |