Jeff Parker (born April 4, 1967) is an American jazz and rock guitarist based in Los Angeles. Parker is best known as an experimental musician, working with avant-garde electronic, rock, and improvisational groups.

Parker currently plays guitar in the post-rock group Tortoise and also was a founding member of the ensembles Isotope 217 and the Chicago Underground Trio in the 1990s and early 2000s. He is also a member of the Association for the Advancement of Creative Musicians, as well as working with musicians George Lewis, Ernest Dawkins, Brian Blade, Joshua Redman, Fred Anderson (musician) and Jason Moran. He released his first solo album in 2003.