Goldwin[a] Arthur Martin CC QC (17 May 1913 – 26 February 2001) was a Canadian lawyer and judge who was known as an expert on criminal law.

[4] John Arnup called Martin "the greatest criminal lawyer this country has produced".

[5] As a criminal defender, Martin developed techniques including the use of expert witnesses and the insanity defence.

[4] In 1993, Martin chaired a royal commission on the use of plea bargaining in Ontario.

The commission's recommendations enhanced the reputation of plea bargains, which had earlier been viewed with some suspicion by lawyers and judges.