Sir Ernest MacLagan Wedderburn (3 February 1884 – 3 June 1958) was a Scottish lawyer, and a significant figure both in the civic life of Edinburgh and in the legal establishment.
He held the posts of Professor of Conveyancing in the University of Edinburgh (1922–35), Deputy Keeper of the Signet (1935–54), and Chairman of the General Council of Solicitors (1936–49), the forerunner to the Law Society of Scotland, and chaired the latter 1949/50.
He was also an enthusiastic amateur scientist, and first Treasurer then Vice President of the Royal Society of Edinburgh.