Archibald Campbell Douglas (usually simply referred to as Campbell Douglas) (14 June 1828 – 14 April 1910) was a Scottish architect based primarily in Glasgow. He designed many churches in Glasgow and Edinburgh, especially those for the Free Church of Scotland. He was three times President of the Glasgow Architectural Association and in 1891 was the Vice President of the Royal Institute of British Architects. He was active in politics, and was a member of the Scottish Liberal Club, Glasgow Liberal Club and National Liberal Club (in London). He was also a Justice of the Peace in Argyllshire.