Masaki Saito (斎藤 雅樹, Saitō Masaki, born February 18, 1965 in Kawaguchi, Saitama, Japan) is a Japanese former Nippon Professional Baseball pitcher. He played for the Yomiuri Giants from 1984 to 2001. He won the Eiji Sawamura Award three times, 1989, 1995, and 1996, and he won the Nippon Professional Baseball Most Valuable Player Award in 1990.