William Gilbert ("W.G.") Grace, MRCS, LRCP (18 July 1848 – 23 October 1915) was an English amateur cricketer who is widely acknowledged as one of the greatest players of all time, and who was important in the development of the sport. Universally known as "W.G.", he played first-class cricket for a record-equalling 44 seasons, from 1865 to 1908, during which he captained England, Gloucestershire County Cricket Club, the Gentlemen, MCC, the United South of England Eleven and several other teams. He came from a cricketing family: the appearance in 1880 of W. G. with E. M. Grace, one of his elder brothers, and Fred Grace, his younger brother, was the first time three brothers played together in Test cricket.

Right-handed as both batsman and bowler, Grace dominated the sport during his career. His technical innovations and enormous influence left a lasting legacy. An outstanding all-rounder, he excelled at all the essential skills of batting, bowling and fielding, but it is for his batting that he is most renowned. He is held to have invented modern batsmanship. Usually opening the innings, he was particularly admired for his mastery of all strokes, and his level of expertise was said by contemporary reviewers to be unique. He generally captained the teams he played for at all levels because of his skill and tactical acumen.