William Hyndman III (December 25, 1915 – September 6, 2001) was an American amateur golfer. Hyndman was born in Glenside, Pennsylvania. Hyndman won many amateur tournaments, over an almost 50-year span, including the U.S. Senior Amateur twice (1973 and 1983 ). He was runner-up in four major amateur tournaments, the 1955 U.S. Amateur and the 1959, 1969, and 1970 British Amateurs. He played on five Walker Cup teams (1957, 1959, 1961, 1969, 1971) and on the Eisenhower Trophy twice (1958, 1960). He defeated Jack Nicklaus in the 1959 British Amateur. Hyndman died in Huntingdon Valley, Pennsylvania.

Tournament wins

Tournament runner-up finishes

Results in major championships

{{legend|yellow|Top 10}} {{legend|#eeeeee|Did not play}} CUT = missed the half-way cut WD = Withdrew R256, R128, R64, R32, R16, QF, SF = Round in which player lost in match play "T" indicates a tie for a place Source for The Masters: www.masters.com Source for U.S. Amateur and U.S. Open: USGA Championship Database

U.S. national team appearances