Josef Greindl (23 December 1912 - 16 April 1993) was a German operatic bass, remembered mainly for his performances of Wagnerian roles at Bayreuth beginning in 1943.

Greindl had a voice like a gravel quarry—massive, wide, deep, rough, and ancient-sounding, grey-timbred rather than black. From the mid-1940s through the late 1960s he was one of the three or four leading performers of Wagner's and Mozart's big bass roles, possessing the size and strength for the former and the dexterity, brains, and extreme range for the latter. He frequently appeared as Fafner, Hunding, and Hagen in the same performance of the Ring Cycle, which made him the only singer in the cast who had to perform all four nights. His earliest recorded singing was at Bayreuth, as Pogner the goldsmith, a character in his fifties or sixties, in 1943 when he (Greindl) was 31 years old. Although he was not as tall as some other big basses, his stage-presence was formidable.