William Mortimer

William Mortimer may refer to:


 * William Mortimer (rugby union) (1874–1916), English rugby union forward
 * William Mortimer (architect) ((1841/42–1913), English architect
 * William Mortimer (cricketer) (1833–1916), English cricketer and British Army officer
 * William James Mortimer (died 2010), publisher, president and editor of the Deseret News
 * William Chapman Mortimer (1907–1988), Scottish novelist