The Southwestern Moundbuilders are the athletic teams that represent Southwestern College, located in Winfield, Kansas, in intercollegiate sports as a member of the National Association of Intercollegiate Athletics (NAIA), primarily competing in the Kansas Collegiate Athletic Conference (KCAC) since the 1958–59 academic year; which they were a member on a previous stint from 1902–03 to 1922–23. The Moundbinders previously competed in the Central Intercollegiate Athletic Conference (CIC) from 1923–24 to 1957–58.