Michael Anthony Mangini (born April 18, 1963) is an American musician, primarily known as the former drummer of progressive metal band Dream Theater, with whom he played between 2010 and 2023.

[4] After graduating, from Waltham Senior High School in 1981,[5] Mangini put aside his music studies to pursue a computer science major at Bentley University.

That year, he joined Boston hard rock band Extreme, replacing original drummer Paul Geary.

Mangini played on three songs on Extreme's 1995 album Waiting for the Punchline, and appeared with the band on the Late Show with David Letterman.

[8] During a hiatus on Vai's Ultra Zone tour in 2000, Mangini returned to Boston, where he served as an associate professor at Berklee College of Music.

Distance over Time, Mangini's fourth studio album with Dream Theater, featured his debut as a lyricist, on the song "Room 137".

On October 25, 2023, Dream Theater announced that Mangini was leaving the band and that their former drummer Mike Portnoy was returning in his place.

"[11][12] Mangini served as the drummer for Dream Theater bandmate John Petrucci on the G3 tour, along with bassist Dave LaRue, in 2012 and 2018.