James Francis Williams (October 4, 1943 – January 26, 2024) was an American professional baseball infielder, coach and manager in Major League Baseball (MLB). He played for the St. Louis Cardinals in 1966 and 1967 and managed the Toronto Blue Jays, Boston Red Sox, and Houston Astros.

Williams was born in Santa Maria, California, and briefly appeared in two MLB seasons as a second baseman and shortstop for the Cardinals. After his playing career, he managed in the California Angels' minor league system before coaching at the MLB level and then managing for the Blue Jays (1986–1989), Red Sox (1997–2001) and Astros (2002–2004). Williams was the American League Manager of the Year in 1999. He also coached for Toronto, the Atlanta Braves and Philadelphia Phillies. As a coach, Williams was a member of the 1995 World Series and 2008 World Series champions.

James Francis Williams was born on October 4, 1943, in Santa Maria, California. He was one of seven children; his father was a cattle rancher and his mother was a teacher. Williams' father died when he was a teenager.

Williams, a former infielder who threw and batted right-handed, graduated from Arroyo Grande High School in Arroyo Grande, California, and California State University, Fresno, where he played college baseball for the Fresno State Bulldogs. He first spelled his name "Jimy" as a prank in high school. At Fresno, Williams earned a bachelor's degree in agribusiness in 1964.

During the 1965 season, he played for the Alaska Goldpanners of Fairbanks, along with teammates Graig Nettles and Tom Seaver. Williams signed originally with the Boston Red Sox and was taken in the 1965 Rule 5 draft by the St. Louis Cardinals. He appeared in 14 games for the Cardinals over two seasons, 1966–67, but had only 13 at bats, compiling a batting average of .231. Williams' first hit came off Juan Marichal.

Before the 1968 season, the Cardinals traded Williams and Pat Corrales to the Cincinnati Reds for Johnny Edwards. After the 1968 season, the Montreal Expos selected Williams in the 1968 expansion draft; then he played the 1969 AAA season for the Vancouver Mounties. He spent the 1970 season playing in AAA for the Buffalo Bisons and the Winnipeg Whips, followed by the 1971 season with the Winnipeg Whips and the Tidewater Tides.

Williams's playing career ended due to a shoulder injury. He began his minor league managing career with the California Angels in 1974. Williams soon reached the Triple-A level and was appointed the third base coach of the Toronto Blue Jays in 1980.

Williams remained as Toronto's third base coach for six seasons. After the 1985 season, Blue Jays' manager Bobby Cox left the organization to rejoin the Atlanta Braves and the Blue Jays named Williams as their new manager. He was the Blue Jays' manager until the 1989 season, when he was fired May 14 and replaced by Cito Gaston after the team got off to a 12–24 start. Under Gaston, the Blue Jays went 77–49 for the rest of the season and won the American League East title. Williams finished with a record of 281 wins and 241 losses.