The Lewis Flyers are the athletic teams that represent Lewis University, located in Romeoville, Illinois, United States, in intercollegiate sports as a member of the Division II level of the National Collegiate Athletic Association (NCAA), primarily competing in the Great Lakes Valley Conference (GLVC) for most of its sports since the 1980–81 academic year; while its men's volleyball team competes in the Midwestern Intercollegiate Volleyball Association (MIVA).

[2] The men's and women's track and field and cross country teams have had a long history of success, with 85 athletes being awarded All-American since 1988.

In 2003 the men's volleyball team won the NCAA Division I/II National Collegiate Men's Volleyball Championship, defeating BYU in the final, but it later voluntarily gave back its title after an internal investigation found ineligibility issues that were kept private from the NCAA.

This disgrace hurt the program for a few years, but they have slowly climbed their way back into the Top-10 rankings of DI-II schools.

[4] The women's volleyball team has qualified for 19 straight NCAA Regional Championships (2006-2024), having made it to the final 4 in 2016 and 2018 Lewis also competes intercollegiately in rugby as a member of the Chicago Area Rugby Football Union (CARFU).