William or Bill Glynn may refer to:
William Glyn (bishop) (1504–1558), bishop of Bangor William Glynn (cricketer) (1846–1895), Australian cricketer William Burns Glynn (1923–2014), British engineer and researcher of the pre-Columbian era in Peru Bill Glynn (footballer) (1900–1978), Australian rules footballer Bill Glynn (baseball) (1925–2013), Major League Baseball first baseman Bill Glynn (entrepreneur) (born 1968), American entrepreneur