John P. McCullough (born October 5, 1956) is a retired National Basketball Association (NBA) basketball player. McCullough was a Big Eight Player of the Year and NCAA All-American for the University of Oklahoma. McCullough was drafted in the fourth round of the 1979 NBA draft by the Kansas City Kings. His only season in the NBA was for the Phoenix Suns in 1981–82. McCullough was an assistant coach at Southern Methodist University and the University of New Mexico before becoming the head coach at New Mexico Highlands University from 1996 to 2000. McCullough was later the head coach of the women's program at Oklahoma Baptist University.
On June 1, 2016, McCullough was promoted to assistant coach by the Portland Trail Blazers after spending the previous four seasons as the team's advance scout. He is a former college teammate to Trail Blazers head coach Terry Stotts.