Coby Joseph Dietrick (born July 23, 1948) is an American former professional basketball player. Dietrick played college basketball for the San Jose State Spartans, where he was a second-team All-Pacific Coast Athletic Association selection in 1970. He played thirteen seasons (1970–1983) of professional basketball in both the American Basketball Association and the National Basketball Association. Dietrick spent the majority of his career with the San Antonio Spurs, a team that began in the ABA but joined the NBA after the ABA-NBA merger in 1976. He also played with the NBA's Chicago Bulls. In 1983, he retired with ABA/NBA career averages of 6.1 points per game and 4.5 rebounds per game. He later worked as a color commentator for the Spurs. He also opened the first Relax The Back franchise store in San Antonio in 1989.