The 1977–78 AHL season was the 42nd season of the American Hockey League. The season was in jeopardy when the last of the original eight franchises of the "International-American Hockey League", the Rhode Island Reds (previously Providence Reds) folded in the offseason, and the AHL was left with five teams. The league increased its member teams by four, when the North American Hockey League and Southern Hockey Leagues both folded before the 1977–78 season. Two teams joined from the NAHL, and another from the SHL, along with one expansion team.