Michael Peter Balzary (born October 16, 1962), more commonly known by the stage name Flea, is an American bassist, trumpet player, and occasional actor. He is best known as the bassist and founding member of the alternative rock band Red Hot Chili Peppers. His work with the band incorporates several musical styles, ranging from aggressive slap bass, to more subdued and melodic techniques. Aside from the Red Hot Chili Peppers, he has collaborated with many artists, including Jane's Addiction and Alanis Morissette. Drawing influences from funk and punk rock, Flea centers his bass playing on simplicity and minimalism, viewing complexity as something that should be used in moderation.

Originally a trumpet prodigy, Flea first learned to play bass in high school after being taught by close friend and future Red Hot Chili Peppers guitarist Hillel Slovak, who needed a bassist for his band Anthym. Flea joined the group, but left after several months to play for the punk rock group Fear. He rejoined Slovak to form an intended one-off band along with fellow high school alumni Anthony Kiedis and Jack Irons that would eventually become the Red Hot Chili Peppers. Flea has made forays into acting, appearing in numerous films such as Thrashin' (1986) and The Big Lebowski (1998).