Robert Scott Adsit (born November 26, 1965) is an American actor, comedian, and writer. Born and raised in the Chicago suburbs, Adsit joined the mainstage cast of Chicago's The Second City in 1994 after attending Columbia College Chicago. He appeared in several revues, including Paradigm Lost for which he won The Joseph Jefferson Award for Best Actor in a Comedy.

From 2005 to 2008, he codirected, co-wrote and coproduced the Adult Swim stop-motion animation program Moral Orel with Dino Stamatopoulos and Jay Johnston. He also voiced several characters and was nominated for an Annie Award for his work as Clay Puppington, Orel's father. After the success of Moral Orel, Adsit and Stamatopoulos worked together again on the stop-motion animation series Mary Shelley's Frankenhole (2010–2012).

Adsit is known for his role as Pete Hornberger, the well-meaning but jaded producer, on the NBC sitcom 30 Rock, which won a Screen Actors Guild Award for Outstanding Performance by an Ensemble in a Comedy Series in 2008. In 2014, Adsit voiced the robot Baymax in the Disney animated film Big Hero 6, which he reprised in both Big Hero 6: The Series (2017–2021) and the Disney+ series Baymax!

Adsit was born in Northbrook, Illinois on November 26, 1965, the son of Genevieve "Genny" (née Butz) and Andrew Scott Adsit, a real estate attorney. He attended Glenbrook North High School, where he recalled being "a bit of a class clown", and attended Indiana's DePauw University for one semester. He then attended Columbia College Chicago, where acting teacher Sheldon Patinkin encouraged him to join the city's famed improv troupe, The Second City.

Adsit joined Second City in 1987, and became part of its mainstage cast in 1994. He appeared in several Joseph Jefferson Award-winning revues, including Piñata Full of Bees and Paradigm Lost for which he won The Jeff Award for Best Actor in a Comedy. A sketch he performed with future Saturday Night Live head writer Adam McKay, "Gump," was included as one of Second City's all-time best in the theater's 25th anniversary compilation. He appeared in the 1997 PBS documentary about the process of creating the Second City review, Paradigm Lost, Second to None along with castmates Tina Fey, Kevin Dorff, Rachel Dratch, Jenna Jolovitz and Jim Zulevic.

In 1996, he portrayed an alcoholic and drug-addicted father in Minnesota's Hazelden Substance Abuse Clinic short-subject production, Reflections From The Heart Of A Child. This 26-minute video/DVD feature has become required curriculum in most DWI Repeat Offender classes and substance abuse rehabilitation clinics across the U.S. In 1997, Adsit recorded the voices for the King of Payne, Sir Psycho, The Duke of Bourbon, and Merlin for Williams' Medieval Madness pinball machine. Adsit co-wrote the game's recorded dialog with fellow Second City cast member, Kevin Dorff. Dorff and Tina Fey also played the character voices in the game.

In 1998, Adsit moved to Los Angeles after an invitation from his college friend Dino Stamatopoulos to work on a pilot about the backstage antics of a television sketch-comedy variety show. The pilot did not materialize as a show, but Adsit stayed in California and began working in bit parts and commercials. That same year, he appeared as a cast member in the renowned sketch comedy program, Mr. Show. He also plagued the band Tenacious D as a neighbor and a demon in their HBO show.

In 2001, he starred in an episode of Friends, "The One with Ross and Monica's Cousin" in season 7.