Michael Peter Balzary (born October 16, 1962), better known by his stage name Flea, is an Australian-born American musician and occasional actor. He is best known as the bassist, co-founding member, and one of the composers of the rock band Red Hot Chili Peppers. Flea is also the co-founder of Silverlake Conservatory of Music, a non-profit music education organization founded in 2001.

Originally a jazz trumpet prodigy, Flea learned to play bass in high school from close friend and future Red Hot Chili Peppers guitarist Hillel Slovak, who required a bassist for his band Anthym. Flea soon developed his own style and joined the group, but quit several months later in order to play for the punk rock outfit Fear. He then rejoined Slovak to form an intended one-off band Tony Flow and the Majestic Masters of Mayhem along with fellow high school alumni Anthony Kiedis and Jack Irons; the impromptu collaboration would ultimately give birth to the Red Hot Chili Peppers.

Highly regarded as one of the best rock bass players of all time, his work as a bassist incorporates several musical styles, ranging from aggressive slap bass to more subdued and melodic techniques. Drawing influences from funk music and punk rock, Flea centers his playing on simplicity and minimalism while viewing complexity as a device that should be used in moderation. Aside from the Red Hot Chili Peppers, he has collaborated with many artists, including Jane's Addiction, Atoms for Peace, The Mars Volta, Alanis Morissette, Johnny Cash, Young MC, P and as more recently, Rocketjuice and The Moon. Flea is ranked #2 on Rolling Stone's "Readers Pick the Top Ten Bassists of All Time". Along with his Red Hot Chili Peppers bandmates, past and present, Flea was inducted in the 2012 Rock and Roll Hall of Fame on April 14, 2012.