Bernard Harold Ian Halley Stewart, Baron Stewartby, PC, Kt, RD, FSA, FRSE, FBA (10 August 1935 – 3 March 2018) was a British Conservative Party politician and numismatist.

[2] Stewart contested Hammersmith North at the 1970 general election, being beaten by Frank Tomney of the Labour Party.

After he left the House of Commons, Stewart was created a life peer as Baron Stewartby, of Portmoak in the District of Perth and Kinross on 20 July 1992.

Noting the lack of a complete book on the subject more recent than Edward Burns' 1887 work Coinage of Scotland, he was encouraged to write his own.

In July 2007, Stewartby's collection of antique Scottish coins dating back to the 12th century and worth an estimated £500,000 was stolen from his home near Peebles.