Angelo Bartlett "Bart" Giamatti (pronounced /dʒiːəˈmɑːti/; April 4, 1938 – September 1, 1989) was the president of Yale University and later the seventh Commissioner of Major League Baseball. Giamatti negotiated the agreement that terminated the Pete Rose betting scandal by permitting Rose to voluntarily withdraw from the sport, avoiding further punishment.

Giamatti was born in Boston and grew up in South Hadley, Massachusetts, the son of Mary Claybaugh Walton (Smith College '35) and Valentine John Giamatti. His father was chairman of the Department of Italian Language and Literature at Mount Holyoke College. Giamatti's paternal grandparents were Italian immigrants, and his grandfather, Angelo Giammattei [sic], emigrated to the United States from Telese, near Naples, Italy, around 1900. Giamatti's maternal grandparents, from Wakefield, Massachusetts, were Helen Buffum (Davidson) and Bartlett Walton, who graduated from Phillips Academy Andover and Harvard College.