William Kay may refer to:
Politicians William Kay (politician) (1829–1889) businessman and politician in South Australia William A. Kay (1864-1931), American politician William Frederic Kay (1876–1942), Canadian politician
Sports William Kay (cricketer) (1893-1973), Australian cricketer Will Kay (born 1984), rugby player Bill Kay (baseball) (1878–1945), outfielder in Major League Baseball Bill Kay (defensive back) (born 1960), former American football player, a defensive back for the Houston Oilers. Bill Kay (tackle) (1925-2007), American football player, a tackle for the New York Giants. Billy Kay (wrestler) (born 1989), Australian professional wrestler
Baronets Sir William Kay, 2nd Baronet (died 1850) of the Kay baronets Sir William Algernon Kay, 5th Baronet (1837–1914) of the Kay baronets Sir William Algernon Ireland Kay, 6th Baronet CMG DSO (1876–1918) of the Kay baronets
Others William Kay (journalist), British financial and business journalist William Kay (priest) (1894–1980), Anglican Provost of Blackburn William Kay (scholar) (1820–1886), English cleric and academic Billie Kay (born 1989), Australian professional wrestler Billy Kay (actor) (born 1984), American film and television actor Billy Kay (writer) (born 1951), writer, broadcaster and language activist William Kay, namesake of Kaysville, Utah
See also William Kaye (disambiguation)