| Mode: | Basketball |
| Year: | 1983–84 |
| Prev Year: | 1982–83 |
| Next Year: | 1984–85 |
| Team: | Marshall Thundering Herd |
| Conference: | Southern Conference |
| Short Conf: | SoCon |
| Record: | 25–6 |
| Conf Record: | 13–3 |
| Hc Year: | 1st |
| Asst Coach1: | Dan Bell |
| Asst Coach3: | John Lyles |
| Champion: | SoCon regular season champions SoCon tournament champions |
| Tourney Result: | First Round |
The 1983–84 Marshall Thundering Herd men's basketball team represented Marshall University during the 1983–84 NCAA Division I men's basketball season. The Thundering Herd, led by first-year head coach Rick Huckabay, played their home games at the Cam Henderson Center as members of the Southern Conference. They finished the season 25–6, 13–3 in SoCon play to finish in first place. They defeated,, and to become champions of the SoCon tournament. They received the SoCon's automatic bid to the NCAA tournament where, as a No. 10 seed, they lost to No. 7 seed Villanova in the opening round.
|-!colspan=9 style=| Regular season|-!colspan=9 style=| SoCon tournament|-!colspan=9 style=| NCAA tournament[2] [3]