Robert Samuel Langer (born 3 October 1948) is a former cricketer who played for Western Australia in the 1970s and 1980s. He was a left-handed middle order batsman and occasional right-arm medium pace bowler. Langer's first-class career extended from 1973–1974 until 1981–1982. He made 2,756 first-class runs in 44 matches at an average of 43.06 with a highest score of 150 not out. In 15 limited overs matches, his best score was 99 not out in a total of 338 runs at 28.16 average. Langer scored five first-class hundreds and 18 half-centuries during his career. In 1977, he signed to play World Series Cricket for the WSC Australian team and spent the 1977–78 and 1978–79 seasons with WSC.