The Roman Town House in Dorchester is a Roman ruin within Colliton Park, Dorchester, Dorset. Dorset County Council acquired Colliton Park in 1933 as the site for the construction of County Hall. The Town House was discovered in 1937/38 during an archaeological investigation carried out by the Dorset Natural History and Archaeological Society prior to the construction of the new building. Plans for County Hall were modified so that the Town House could be retained on site.