Lothian Chambers, formerly Midlothian County Buildings, is a municipal structure on George IV Bridge in Edinburgh, Scotland.

[1][4][5] The design involved a symmetrical main frontage with nine bays facing onto George IV Bridge; the central section of three bays, which projected forward, featured a doorway on the ground floor flanked by pairs of banded Doric order columns supporting an entablature with triglyphs and a segmental pediment.

On the first floor, there was a tetrastyle portico formed by Ionic order columns supporting an entablature inscribed with the words "Midlothian County Buildings" and a pediment with fine carvings in the tympanum.

[1] An ornate frieze, designed by William Birnie Rhind and depicting the mining, agriculture and fishing industries, was installed high up on the rear elevation of the building which faced St Giles' Cathedral.

[9] Following a review in 2017, Edinburgh City Council decided that the building was surplus to requirements and, in 2018, the local Registrar's Office relocated to new premises at 253 High Street.