Robert Paul "Bob" Kraft (June 16, 1927 – May 26, 2015) was an American astronomer. He performed ground breaking work on Cepheid variables, stellar rotation, novae, and the chemical evolution of the Milky Way. He also served as director of the Lick Observatory (1981–1991), president of the American Astronomical Society (1974–1976), and president of the International Astronomical Union (1997–2000).