Kathryn Crosby (November 25, 1933 - September 20, 2024) was an American actress and singer who also performed under the stage-name Kathryn Grant.

Born Olive Kathryn Grandstaff in Houston, Texas, she graduated from the University of Texas at Austin with a Bachelor of Fine Arts in 1955. Two years later she became Bing Crosby's second wife. The couple had three children, Harry, Mary Frances, and Nathaniel. She appeared as a guest star on her husband's 1964–1965 ABC sitcom The Bing Crosby Show.