| First Name | Mike |
| Last Name | Portnoy |
| Full Name at Birth | Michael Stephen Portnoy |
| Age | 44 |
| Date of Birth | April 20, 1967 |
| Birthplace | Chicago, Illinois, USA |
| Height | 5' 10" (178 cm) |
| Star Sign | Aries |
| Religion | Jewish |
| Nationality | American |
| University | Berklee College of Music, Boston, Massachusetts, USA |
| Occupation | Drummer, Vocalist |
| Occupation Category | Musician |
| Claim to Fame | Dream Theater, Avenged Sevenfold |
| Favorite Movies | A Clockwork Orange [1971]Magnolia [1999]Requiem for a Dream [2000] |
Michael Stephen "Mike" Portnoy (born April 20, 1967) is an American drummer primarily known as the former drummer, backing vocalist, and a co-founder of the progressive metal band Dream Theater. Known for his drumming prowess and technical skill, Portnoy has won 23 awards from the Modern Drummer magazine. He has co-produced the last six Dream Theater albums with guitarist John Petrucci, starting from Metropolis Pt. 2: Scenes from a Memory. From A Change of Seasons onwards, Portnoy had been writing a substantial amount of Dream Theater's lyrics. He is the second youngest person (after Neil Peart) to be inducted into the Modern Drummer's Hall of Fame (at 37 years of age).