William Birch, Bill Birch or Billy Birch may refer to:
Bill Birch (1934–2026), New Zealand politician Bill Birch (footballer) (born 1944), English and Australian footballer and coach Billy Birch (1831–1897), American minstrel performer William Birch (Australian cricketer) (1849–1897), Australian cricketer William Birch (English cricketer) (1863–1940), English cricketer William Birch (footballer) (1887–1968), English footballer William Birch (painter) (1755–1834), English and US miniature painter, enameler and engraver William Birch (settler) (1842–1920), English settler in North Island, New Zealand William Fred Birch (1870–1946), American politician William John Birch (1811–1891), English freethinker