Michael Rosenbaum (born July 11, 1972) is an American actor and podcaster. He is known for portraying Lex Luthor on the television series Smallville, a role that TV Guide included in their 2013 list of "The 60 Nastiest Villains of All Time".

Rosenbaum is also known for portraying Martinex in Guardians of the Galaxy Vol. 2 and Guardians of the Galaxy Vol. 3, Parker in Urban Legend, Adam/Adina in Sorority Boys and Dutch Nilbog on Fox's Breaking In. He also has an extensive voiceover career in animation, such as his role of Wally West / The Flash in the DC Animated Universe series Justice League (2001–2004) and its sequel Justice League Unlimited (2004–2006). Between 2015 and 2016, he played the lead role in the TV Land comedy series Impastor.

He is also the lead singer of the band Sun Spin with his friend Rob Danson. The band's first album, Best Days was released on February 9, 2021.