The 1978 Big Sky Conference Men's Basketball Tournament was held March 3–4 at Adams Field House at the University of Montana in Missoula, Montana. Weber State upset top-seeded Montana in the championship game, 62–55 (in overtime), to clinch their first conference tournament title. the first of three consecutive. They had lost in the final in the first two editions. The end of regulation time saw the teams tied at 49 points each; host Montana missed a potential winning free throw with seconds left.