| Competition: | League of Ireland |
| Season: | 1965–66 |
| Winners: | Waterford (1st Title) |
| League Topscorer: | Mick Lynch Waterford 17 |
| Matches: | 132 |
| Total Goals: | 433 |
| Prevseason: | 1964–65 |
| Nextseason: | 1966–67 |
Statistics of League of Ireland in the 1965/1966 season.
It was contested by 12 teams, and Waterford won the championship.
| Rank | Player | Club | Goals |
|---|---|---|---|
| 1 | Mick Lynch | Waterford | 17 |
| 2 | Shamie Coad | Waterford | 14 |
| 2 | Bobby Gilbert | Shamrock Rovers | 14 |
| 2 | Liam Tuohy | Shamrock Rovers | 14 |
| 5 | Tony Allen | Cork Hibernians | 12 |
| 5 | Frank O'Neill | Shamrock Rovers | 12 |
| 7 | Billy Dixon | Drumcondra | 11 |
| 8 | Eric Barber | Shelbourne | 10 |
| 8 | Joe O'Brien | Limerick | 10 |
| 8 | Ben O'Sullivan | Bohemians | 10 |