
Robert Dale "Rob" McElhenney (born April 14, 1977) is an American film and television actor best known for his role as Mac on the FX TV series It's Always Sunny in Philadelphia. He is also credited as creator, developer and executive producer of the show, which has also provided McElhenney with writing and directing credits on various episodes. He is married to Kaitlin Olson, who plays Deandra Reynolds on the show. He has also opened a bar in Philadelphia called Mac's Tavern.
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Deadpool & Wolverine
2024 · as TVA Soldier

The Devil's Own
1997 · as Kevin

A Civil Action
1998 · as Teenager on Property

Wonder Boys
2000 · as Student

Latter Days
2004 · as Elder Harmon

A Very Sunny Christmas
2009 · as Ronald "Mac" McDonald

Thirteen Conversations About One Thing
2001 · as Aspiring Medical Student

Campfire Stories
2001 · as Ricky

The Tollbooth
2004 · as Simon Stanton

All Star Bowling Trick Shots
2012

The Nightman Cometh: Live
2009 · as Mac McDonald

PaleyLive: It’s Always Sunny in Philadelphia 20th Anniversary Celebration!
2025 · as Self

A Tribute to Ryan Dunn
2011 · as Self