Reilly, Ace of Spies is a 1983 British television programme dramatizing the life of Sidney Reilly, a Russian-born adventurer who became one of the greatest spies ever to work for the United Kingdom and the British Empire.

Among his exploits, in the early 20th century, were the infiltration of the German General Staff in 1917 and a near-overthrow of the Bolsheviks in 1918.

He praised the production and Sam Neill's performance and summarized "a mixed bag of pleasures, but it's worth dropping in on, if not in whole, then at least in part.

"[2] Costume designer Elizabeth Waller was nominated for a 1984 British Academy Television Craft Award for best costume design for the series, and editors Edward Marnier and Ralph Sheldon won the BAFTA TV Craft award for Best Film Editor.

[5] The series was issued on Region 1 DVD by A&E Home Entertainment, under licence from THAMES International, talkbackTHAMES and FremantleMedia Ltd on 22 February 2005.