Cronyn is a surname. Notable people with the surname include:
Benjamin Cronyn (1802–1871), the first bishop of the Anglican Diocese of Huron Hume Cronyn, OC (1911–2003), Canadian actor of stage and screen Hume Cronyn (politician) (1864–1933), Canadian politician and lawyer
See also William B. Cronyn House, also known as the House at 271 Ninth Street, is a historic home located in Brooklyn, New York, New York Frederick Cronyn Betts (1896–1938), Canadian politician and solicitor Cronin