| Year: | 2021–22 |
| Team: | Western Illinois Leathernecks |
| Sport: | basketball |
| Conference: | Summit League |
| Short Conf: | The Summit |
| Record: | 16–16 |
| Conf Record: | 7–11 |
| Head Coach: | Rob Jeter |
| Hc Year: | 2nd |
| Assoc Coach: | Chad Boudreau |
| Asst Coach2: | Kyle Heikkinen |
| Asst Coach3: | Nick Irvin |
| Stadium: | Western Hall |
| Tourney: | The Basketball Classic |
| Tourney Result: | first round |
The 2021–22 Western Illinois Leathernecks men's basketball team represented Western Illinois University in the 2021–22 NCAA Division I men's basketball season. The Leathernecks, led by second-year head coach Rob Jeter, played their home games at Western Hall in Macomb, Illinois, as members of the Summit League. They finished the regular season 16–15, 7–11 in Summit League play, to finish in a tie for sixth place. As the No. 6 seed in the Summit League tournament, they lost Oral Roberts in the quarterfinals. They received an invitation to The Basketball Classic postseason tournament, formerly known as the CollegeInsider.com Tournament.
In a season limited due to the ongoing COVID-19 pandemic, the Leathernecks finished the 2020–21 season 7–15, 5–9 in Summit League play, to finish in seventh place. They lost to South Dakota in the quarterfinals of the Summit League tournament.[1]
|-!colspan=12 style=| Exhibition|-!colspan=12 style=| Regular season|-!colspan=9 style=|Summit League tournament|-!colspan=9 style=| The Basketball ClassicSource:[2]