Bayh is a surname. Notable people with the name include:

• 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
• Evan Bayh, (Birch Evans Bayh III, born 1955) U.S. Senator and governor of Indiana
• Marvella Bayh (1933–1979), wife of Indiana Senator Birch Bayh
• Susan Bayh (born 1959), American attorney and First Lady of Indiana

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