Dame Margaret Henderson Kidd, Mrs. MacDonald QC (14 March 1900, Bo'ness, Scotland – died 22 March 1989, Cambridge, England) was a Scottish legal advocate, editor and politician.The elder daughter of James Kidd, solicitor and Unionist MP for Linlithgowshire, and Janet Gardner Kidd (née Turnbull), a schoolteacher, Margaret Kidd was educated at Linlithgow Academy and graduated with an MA and LLB from the University of Edinburgh in 1922.