Samuel Thornton Jagger (30 June 1904 – 30 May 1964) was a Welsh first-class cricketer who played on more than 40 occasions between the wars. He was later to work as a housemaster at Lancing College.^[1]

Educated at Malvern College, he captained the cricket eleven in both 1921 and 1922.^[1] His first-class debut came for Worcestershire against Somerset at Weston-super-Mare in August 1922. In a drawn match, Jagger took three first-innings wickets.^[2] He also played for Worcestershire, as well as Cambridge University, the following season, but it was then discovered that his county qualification was invalid.^[1] During 1923, he made his only first-class half-century when he hit 58 for Cambridge against Essex.^[3]

Jagger played no first-class cricket in 1924, but in the two years thereafter he appeared regularly for Cambridge and won his Blue. In early May 1925, he claimed his first five-wicket haul when he took 5–40 against Sussex at Fenner's.^[4] He also claimed five-wicket bags for Cambridge that season against Free Foresters (taking nine in the match) and Surrey,^[5][6] the three bowling feats coming within a space of six weeks. He ended 1925 with 41 first-class wickets (his highest season's aggregate) at 32.21. The following year he picked up another 24 wickets, and achieved a career-best 5–24 against Yorkshire^[7]

From 1927 and 1929, Jagger turned out for Wales, at that point playing a small number of first-class games each year, and played in the side's eight-wicket win over the touring West Indians. The game was dominated by 55-year-old Sydney Barnes' 12 wickets, and the wicketless Jagger's personal contribution was limited to a first-innings 30.^[8] Jagger played a little minor counties cricket for Denbighshire in 1930, but in 1931 returned for his final fling at first-class level, appearing three times without conspicuous success for Sussex.