Brian Thomas ("Bud" or "Buddy") Allin (October 13, 1944 – March 10, 2007) was an American professional golfer who won five PGA Tour events in the 1970s.

A prodigal player, Allin attended Brigham Young University in Provo, Utah and was a member on the golf team along with Johnny Miller.

[1] In 1969, Allin turned pro and qualified for the PGA Tour on his first attempt citing the fact that golf was no "big deal" compared to war.

Allin's first win on the PGA Tour came in 1971 at the Greater Greensboro Open when he defeated Dave Eichelberger and Rod Funseth on the first extra-hole in a playoff.

His best season was in 1974 when he won the Doral Ryder Open and the Byron Nelson Classic, which propelled him to a ninth-place finish on the money list.