Michael Austin Cera ( SERR-ə; Italian: [ˈtʃeːra]; born June 7, 1988) is a Canadian actor. He is known for frequently portraying awkward, shy, quirky, and offbeat characters on stage and screen. Over his career he has received include nominations for a British Academy Film Award, three Critics' Choice Movie Awards, and four Screen Actors Guild Awards, and a Tony Award.

Cera became known for portraying leading roles in a string of comedic films such as Superbad (2007), Juno (2007), and Scott Pilgrim vs. the World (2010), Nick & Norah's Infinite Playlist (2008), and Youth in Revolt (2009). He took supporting roles in both comedies and dramas including Confessions of a Dangerous Mind (2002), This Is the End (2013), Molly's Game (2017), Person to Person (2017), Gloria Bell (2019), Barbie (2023), and Dream Scenario (2023). He voiced Dick Grayson/Robin in The Lego Batman Movie (2017), Barry in Sausage Party (2016).

Cera gained prominence portraying George Michael Bluth in the FX sitcom Arrested Development from 2003 to 2006 and then again from 2013 to 2019. He took a leading role in the Hulu comedy series Life & Beth (2022–2024), and also voiced roles including reprising his roles as Scott Pilgrim in the Netflix series Scott Pilgrim Takes Off (2023), and Barry in the Amazon Prime Video series Sausage Party: Foodtopia (2024).

Cera is also known for his Broadway performances in the Kenneth Lonergan plays This Is Our Youth in 2014, Lobby Hero in 2018, for which he received a nomination for the Tony Award for Best Featured Actor in a Play, and The Waverly Gallery in 2019. In addition to acting, Cera is a musician, having released his debut album True That in 2014. Cera has also performed as the touring bassist for indie rock supergroup Mister Heavenly.