Ronald Edward Blair (born September 16, 1948 in San Diego, California)[1][2] is an American musician notable for being the bassist for Tom Petty and the Heartbreakers.

Blair's father was a Navy man, so the family relocated every few years throughout the United States as well as within Japan and Hong Kong.

Blair eventually moved to Los Angeles, and there teamed up with fellow Gainesville musicians Mike Campbell, Benmont Tench and Stan Lynch.

Mudcrutch had relocated from Gainesville to Los Angeles, but subsequently broke up after failing to sign a recording contract.

Blair went on to play with the band through its first four albums, Tom Petty and the Heartbreakers, You're Gonna Get It!, Damn the Torpedoes and Hard Promises.

In the last couple of years of his first stint with the band, Blair was considering leaving and was not always available, thus being occasionally replaced with other bassists, including Donald "Duck" Dunn, on his last two albums.

He rejoined the Heartbreakers on March 18, 2002, to perform at the band's Rock and Roll Hall of Fame induction ceremony.