Fereydun Robert Armisen (born December 4, 1966) is an American comedian, actor, musician, and television writer. With his comedy partner Carrie Brownstein, he co-created and co-starred in the IFC sketch comedy series Portlandia. He also co-created and starred in the mockumentary IFC series Documentary Now! and the Showtime comedy series Moonbase 8.

Armisen was the bandleader and frequent drummer for the Late Night with Seth Meyers house band, the 8G Band from 2014 to 2024. He was a cast member on the late-night sketch comedy and variety series Saturday Night Live from 2002 to 2013. He voiced Speedy Gonzales on The Looney Tunes Show. He also works as a voice actor in films, such as The Smurfs (2011), The Smurfs 2 (2013), The House of Tomorrow, The Lego Ninjago Movie (both 2017), The Mitchells vs. the Machines (2021), The Super Mario Bros. Movie, The Contestant (both 2023), Thelma the Unicorn (2024) and Fixed (2025).