| Competition: | Campeonato Gaúcho |
| Season: | 1966 |
| Winners: | Grêmio (17th title) |
| Continentalcup1: | Taça Brasil |
| Continentalcup1 Qualifiers: | Grêmio |
| League Topscorer: | Sapiranga (13 goals) |
| Matches: | 132 |
| Total Goals: | 311 |
| Prevseason: | 1965 |
| Nextseason: | 1967 |
The 1966 Campeonato Gaúcho was the 46th season of Rio Grande do Sul's top association football league. Grêmio won their 17th title.[1] [2]
The championship was contested by the twelve teams in a double round-robin system, with the team with the most points winning the title and qualifying to the 1967 Taça Brasil. The last placed team was relegated to the 1967 Second Division.
| Club | Location | Titles | Last season | |
|---|---|---|---|---|
| Aimoré | 11th | |||
| Brasil | 5th | |||
| Farroupilha | 10th | |||
| 9th | ||||
| 3th | ||||
| Grêmio | 1st | |||
| Guarany | 6th | |||
| Internacional | 4th | |||
| Juventude | 2nd | |||
| Pelotas | 7th | |||
| Riograndense | 1st (Second Division) | |||
| Rio Grande | 8th |
A. Caxias was known as Flamengo until 1971.
B. Novo Hamburgo was known as Floriano from 1942 until 1968.