William Gunn (4 December 1858 – 29 January 1921) was an English sportsman who played internationally in both cricket and football.

In first-class cricket, Gunn played professionally for Nottinghamshire from 1880 to 1904 and represented England in 11 Test matches.

[1] Born at St Ann's, Nottingham, Gunn was a specialist right-handed batsman who occasionally bowled slow underarm lobs.

He joined his Nottinghamshire colleagues Alfred Shaw and Arthur Shrewsbury in the English cricket team in Australia in 1886–87.

[1] At the time, rules for throw-ins were not formalised, but when his throws "repeatedly hurtled into Scotland's penalty area from well inside England's own half" in an unofficial match in 1882, he "forced the FA to change the law to [that of] ...

[2][4] Gunn, playing as a winger, made his League debut on 22 September 1888 at Wellington Road, the then home of Aston Villa.

When Billy Gunn played as a winger on 29 September 1888 against Aston Villa he was 29 years 300 days old; that made him, on that fourth weekend of League football, Notts County' oldest player.

In a series of reader's letters appearing in the 'Football Post' in 1920, a Mr. W. Dawson of Sutton–in–Ashfield, shared his reminisces of Billy Gunn: "The finest outside–right who ever played football.