Bayh is a surname. Notable people with the name include:
Beau Bayh (Birch Evans Bayh IV, born 1995), American attorney and politician from Indiana Birch Bayh (coach) (Birch Evans Bayh Sr., 1893–1971), American basketball and baseball coach Birch Bayh (Birch Evans Bayh Jr., 1928–2019), U.S. Senator from Indiana; son of Coach Birch and father of Evan Evan Bayh (Birch Evans Bayh III, born 1955), U.S. Senator and governor of Indiana; son of Senator Birch Marvella Bayh (1933–1979), wife of Senator Birch Susan Bayh (1959–2021), wife of Evan