Michael Joseph Porcaro (born May 29, 1955) is an American bass player. He is best known for his work with the Grammy Award-winning band Toto and is listed as a member on their official website. He retired from touring in 2007 due to his diagnosis of amyotrophic lateral sclerosis (ALS), also known as Lou Gehrig’s disease.
He is the middle brother of Toto members Jeff Porcaro and Steve Porcaro. Their father is jazz drummer-percussionist Joe Porcaro.