Jim Jefferies (full name Geoff James Nugent) is an Australian-American stand-up comedian, political commentator, actor, and writer, born 14 February 1977.

Jefferies is best known for his work in American television, having created and starred in the FX sitcom Legit (2013–2014) and Comedy Central's late-night comedy The Jim Jefferies Show since 2017.

Jefferies has appeared on comedy panel shows such as Never Mind the Buzzcocks, Have I Got News for You, The Heaven and Earth Show and 8 Out of 10 Cats, the US comedy panel show The Green Room with Paul Provenza and Comedy Central's @midnight.