Flesch is a German surname. Notable people with the surname include:
Carl Flesch, Hungarian violinist and pedagogue
Colette Flesch, Luxembourgian former politician and fencer
Jeb Flesch, American football player
Rudolf Flesch, Creator of Flesch Reading Ease test and co-creator of the Flesch-Kincaid Readability Test
Siegfried Flesch, Austrian saber fencer
Steve Flesch, American golfer