| Ulster Cup | |
| Year: | 1977–78 |
| Num Teams: | 12 |
| Defending Champions: | Glentoran |
| Winners: | Linfield (11th win) |
| Second: | Coleraine |
| Matches: | 66 |
| Goals: | 199 |
| Prev Season: | 1976–77 |
| Next Season: | 1978–79 |
The 1977–78 Ulster Cup was the 30th edition of the Ulster Cup, a cup competition in Northern Irish football.[1]
Linfield won the tournament for the 11th time, finishing top of the group standings.[2]