Mac O'Grady (born April 26, 1951) born Phil McGleno, aka Phillip McClelland O'Grady, is an American professional golfer and golf teaching professional who played on the PGA Tour in the 1970s and 1980s, known mainly for his eccentric behavior[2] and brash statements,[3] in addition to his attending PGA Tour qualifying school 17 times before achieving his card.

At one point, O'Grady said "Deane Beman is a thief with a capital T."[7] He was fined $5,000 and was made to serve a six event suspension late in the 1986 PGA Tour year for conduct unbecoming a professional golfer.

O'Grady saying "of the top 30 players worldwide I would be surprised if less than seven stepped to the first tee each week without the use of beta blockers to calm their nerves."

Recognized as one of the world's top instructors;[10] he teaches at his Mac O'Grady Golf Schools[11] and lives in Palm Springs, California.

His teachings and swing concepts were influenced by Homer Kelley's book The Golfing Machine whom O'Grady had studied with personally in his earlier years.