County Hall is a municipal building in Bythesea Road, Trowbridge, Wiltshire, England, completed in 1940.

[6] The design has a symmetrical main frontage with thirteen bays facing onto Bythesea Road, the end bays slightly projected forward; the central section features a three-bay portico in antis with Doric order columns; there is a prominent window, framed by an aedicule, on the first floor and a wooden lantern containing a clock at roof level.

[6] During the Second World War, following concerns that County Hall would be a potential landmark for German aircraft, it was covered in camouflage nets.

[4] An extension to a design by Alec French & Partners was built to the south east of the main building and completed in 1974.

[9][10][11] County Hall has the main office of Wiltshire Council's registration service,[12] and parts of the building are used for ceremonies such as marriage and civil partnership.