John Edmund Mulaney (born August 26, 1982) is an American stand-up comedian, actor, writer, and producer. Born and raised in Chicago, Illinois, Mulaney first gained prominence for his work as a writer on the NBC sketch comedy series Saturday Night Live from 2008 to 2013, where he contributed to numerous sketches and characters, including Stefon, a recurring character he created with Bill Hader. After leaving SNL, Mulaney has hosted the show six times, becoming a member of the SNL Five-Timers Club in 2022.

Mulaney's stand-up specials include The Top Part (2009), New in Town (2012), The Comeback Kid (2015), Kid Gorgeous (2018), and Baby J (2023). He has received two Emmy Awards for Outstanding Writing for a Variety Special for Kid Gorgeous and Baby J. Mulaney released a children's musical comedy special on Netflix, John Mulaney & the Sack Lunch Bunch (2019).

He was the creator and star of the short-lived semi-autobiographical Fox sitcom Mulaney (2014–2015). Mulaney also portrays George St. Geegland in a comedy duo with Nick Kroll, and they have appeared on television and on Broadway in Oh, Hello on Broadway (2016–2017). Mulaney is a co-executive producer, writer, and occasional actor on the IFC mockumentary series Documentary Now! (2015–2022). He was the host, creator, and executive producer of the Netflix talk show John Mulaney Presents: Everybody's in LA (2024) and its spin-off Everybody's Live with John Mulaney (2025).

Among Mulaney's voice roles are Andrew Glouberman in the Netflix original animated show Big Mouth (2017–2025), Peter Porker / Spider-Ham in Spider-Man: Into the Spider-Verse (2018), Chip in Chip 'n Dale: Rescue Rangers (2022), and Big Jack Horner in Puss in Boots: The Last Wish (2022).