Durlston Astronomy centre, observatory at county park. Public outreach events hosted (http://www.durlston.co.uk/visit-astronomy.aspx)
Frome Valley Observatory, small private observatory (http://dorsetastro.synthasite.com/observatory.php)
Horton tower (East Dorset), folly and astronomical observatory, a five story Gothic Tower built in 1750.
Middlehill Observatory, small private observatory (http://www.middlehillobservatory.co.uk/)
Marwick Observatory, West Moors (1919-1926), the final observatory of E.E. Markwick (see Kent) a variable star and solar observer. West Moors village is located in East Dorset is just north of Bournemouth, and just outside the larger settlements of Ferndown.
Portland Observatory, mainly a terrestrial observatory but astronomical meetings have taken place on occasion.
Worth Hill Observatory, Worth Matravers, a private observatory with open evenings, but now relocated to Devon (http://www.dstrange.freeserve.co.uk/)