5 in total: Joe Frazier Ken Norton Leon Spinks Larry Holmes Trevor Berbick
He avenged the first three (two of them twice) and his last two losses were his last two fight when he was well past his best.
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As a Pro, Ali lost 5. He ended his career with a 56 wins(KO 37) - 5 losses (KO 1) + 0 draws.
March 8, 1971, he lost a 15 round decision to Joe Frazier (Title Bout)
March 31, 1973, he lost a 12 round decision to Ken Norton
February 15, 1978, he lost a 15 round decision to Leon Spinks (Title Bout)
October 2, 1980, he lost by a TKO in 10 rounds to Larry Holmes (Title Bout)
December 11, 1981 he lost a 10 round decision to Trevor Berbick
Muhammad Ali's record:
won 56 (37 by knock out0
lost 5 (one by ko)
avenged the first 3 losses, 2 of them twice, with the last 2 coming when he was well past his prime and already showing signs of parkinsons syndrome.
http://www.boxrec.com/list_bouts.php?human_id=180&cat=boxer
Muhammad Ali loses 5 matches in boxing before he came up to retire. His total match records are 17 knockouts, 56 wins and 5 losses.
5 losses, to joe frazier (first fight), Kenny norton (first fight), leon spinks (first fight), and in his very last two fights against Larry Holmes and trevor berbick.