1966 Campeonato Ecuatoriano de Fútbol
The 1966 Campeonato Ecuatoriano de Fútbol was the 8th national championship for football teams in Ecuador. Barcelona won their third national title. They qualified to the 1967 Copa Libertadores along with Emelec.
Qualified teams
The number of teams expanded to sixteen. The qualified teams included the top-eight finishers from the Campeonato Interandino and the Campeonato de Guayaquil.| Competition | Team | Qualification method |
| Guayaquil 8 berths | Emelec | 1966 Guayaquil champion |
| Guayaquil 8 berths | Barcelona | 1966 Guayaquil runner-up |
| Guayaquil 8 berths | 9 de Octubre | 1966 Guayaquil top-eight finishers |
| Guayaquil 8 berths | América de Manta | 1966 Guayaquil top-eight finishers |
| Guayaquil 8 berths | Español | 1966 Guayaquil top-eight finishers |
| Guayaquil 8 berths | Norte América | 1966 Guayaquil top-eight finishers |
| Guayaquil 8 berths | Patria | 1966 Guayaquil top-eight finishers |
| Guayaquil 8 berths | River Plate de Manta | 1966 Guayaquil top-eight finishers |
| Interandino 8 berths | LDU Quito | 1966 Interandino champion |
| Interandino 8 berths | América de Quito | 1966 Interandino runner-up |
| Interandino 8 berths | América de Ambato | 1966 Interandino top-eight finishers |
| Interandino 8 berths | Aucas | 1966 Interandino top-eight finishers |
| Interandino 8 berths | El Nacional | 1966 Interandino top-eight finishers |
| Interandino 8 berths | Macará | 1966 Interandino top-eight finishers |
| Interandino 8 berths | Politécnico | 1966 Interandino top-eight finishers |
| Interandino 8 berths | Universidad Católica | 1966 Interandino top-eight finishers |