The 1977–78 IHL season was the 33rd season of the International Hockey League, a North American minor professional league. Nine teams participated in the regular season, and the Toledo Goaldiggers won the Turner Cup.
| Turner-Cup-Quarterfinals
| | | Turner-Cup-Semifinals
| | | Turner-Cup-Final
| |
| | | | | | | | | | | | | | |
| S1
| Fort Wayne Komets
| 4
| | | |
|
| N5
| Muskegon Mohawks
| 2
| |
| | S1
| Fort Wayne Komets
| 1
| |
|
| |
| | | S2
| Toledo Goaldiggers
| 4
| |
| S2
| Toledo Goaldiggers
| 4
| |
| |
| S3
| Milwaukee Admirals
| 1
| |
| | S2
| Toledo Goaldiggers
| 4
| |
|
| |
| | | N4
| Port Huron Flags
| 3
| |
| N2
| Kalamazoo Wings
| 4
| | |
| |
| N3
| Flint Generals
| 1
| |
| | N2
| Kalamazoo Wings
| 1
| |
|
| |
| | | N4
| Port Huron Flags
| 4
| |
| N1
| Saginaw Gears
| 1
| |
| |
| N4
| Port Huron Flags
| 4
| |