| 1978 Seattle Mariners | ||
|---|---|---|
| League | American League | |
| Division | West | |
| Ballpark | Kingdome | |
| City | Seattle, Washington | |
| Record | 56–104 (.350) | |
| Divisional place | 7th | |
| Owners | Danny Kaye | |
| General managers | Lou Gorman | |
| Managers | Darrell Johnson | |
| Television | KING-TV 5 | |
| Radio | KVI 570 AM (Dave Niehaus, Ken Wilson) | |
| ||
The 1978 Seattle Mariners season was the second in franchise history. The Mariners ended the season by finishing seventh in the American League West with a record of 56–104 (.350).