Bob Cousy (born Robert Cousy, August 9, 1928 in New York City, New York) is a former basketball player, who played guard with the Boston Celtics from 1951 to 1963 and the Cincinnati Royals in the 1969-70 season.

Cousy played at Holy Cross during his college career. In the NBA, he led his team to six championships, including the 1957 one and five consecutive titles, from 1959 to 1963, after which he retired. The five consecutive titles towards the end of his career were part of a Celtics' streak of eight consecutive championships.

Cousy is the Celtics' all time assist leader with 6,955 assists. He also scored 16,960 points, and participated in the all-star game thirteen consecutive times, picking up the most valuable player award at that game in 1954 and 1957. Cousy originally retired after the Celtics' 1962-63 season, but returned seven years later and played seven games for the Cincinnati Royals, now the Sacramento Kings. He coached the Royals from 1969 to 1974, but was never able to help the team improve their record above 36-46. During the 1973-74 season, the Royals' second in Kansas City, Missouri, he was replaced after the team's 6-16 start.

In about 1963 Cousy's best-selling autobiography "Basketball Is My Life" was published. In the book, Cousy describes how breaking his right arm as a child forced him to play sports with his left hand. He felt that the resulting ambidexterity made him a better basketball player.

Cousy has enjoyed a very public life in retirement. He made a talking cameo appearance in 1994's movie Blue Chips, and has worked at different capacities for the Celtics since his playing days were over. He has worked as a commentator on basketball broadcasts. In 1999, he was chosen as one of the NBA's 50 greatest players of all time, and ESPN chose him at number 94 of the 20th century sports century 100 greatest athletes.