| Year: | 1966 |
| Broadcaster: | Swedish: [[Sveriges Radio]]|i=no (SR) |
| Country: | Sweden |
| Preselection: | National final |
| Preselection Date: | 29 January 1966 |
| Song: | Swedish: Nygammal vals|i=no |
| Final Result: | 2nd, 16 points |
Sweden was represented at the Eurovision Song Contest 1966 with the song "Swedish: Nygammal vals|i=no", composed by Bengt-Arne Wallin, with lyrics by Björn Lindroth, and performed by Lill Lindfors and Svante Thuresson. The Swedish participating broadcaster, Swedish: [[Sveriges Radio]]|i=no (SR), selected its entry through a national final titled Swedish: Svensk sångfinal.
Sweden scored 16 points and finished in 2nd place at the contest in Luxembourg, its highest ever placement at the time.
Swedish: Svensk sångfinal (retroactively often referred to as Melodifestivalen 1966) was the selection for the eighth song to represent at the Eurovision Song Contest, held at the Cirkus in Stockholm on 29 January 1966. It was the seventh time that Swedish: [[Sveriges Radio]]|i=no (SR) used this system of picking a song. 898 songs were submitted to SR for the competition. Regional juries selected the winning song. The final was held in the Cirkus in Stockholm on 29 January 1966, hosted by Sven Lindahl and was broadcast on Sveriges Radio TV but was not broadcast on radio.
| Draw | Artist | Song | Songwriters | Place | Points | |
|---|---|---|---|---|---|---|
| 1 | Svante Thuresson | "Hej systrar, hej bröder" | Åke Gerhard | 7th | 6 | |
| 2 | Monica Nielsen | "En röd vals" | Jan Johansson, Kerstin Bergström | 8th | 5 | |
| 3 | Carli Tornehave | "Monte Carlo" | Bengt-Arne Wallin, Carl Gyllenberg | 2nd | 19 | |
| 4 | Gunilla af Malmborg | "Var finns du?" | Ulf Björlin, Lars Forssell | 5th | 8 | |
| 5 | Gunnar Wiklund | "Vinterrosor" | Britt Lindeborg | 3rd | 14 | |
| 6 | Lill Lindfors and Svante Thuresson | "Nygammal vals" | Bengt-Arne Wallin, Björn Lindroth | 1st | 26 | |
| 7 | Ann-Louise Hanson | "En ballad om för längesen" | Robert Meyer, Gösta Rybrant | 4th | 9 | |
| 8 | Carli Tornehave | "Härliga Söndag" | Bo-Göran Edling, Peter Himmelstrand | 5th | 8 | |
| 9 | Gunwer Bergqvist | "Vårens vindar" | Torbjörn Lundqvist, Maud Lundqvist | 9th | 4 | |
| 10 | Gunnar Wiklund | "Vad har jag kvar" | Berndt Öst, Peter Himmelstrand | 10th | 0 |