| Year: | 1966 |
| Country: | Sweden |
| Preselection: | Melodifestivalen 1966 |
| Preselection Date: | 29 January 1966 |
| Song: | Nygammal vals |
| Final Result: | 2nd, 16 points |
Sweden competed in Eurovision Song Contest 1966 with the song "Nygammal vals" performed by Lill Lindfors and Svante Thuresson. It was written by Bengt-Arne Wallin and Björn Lindroth. Sweden scored 16 points and finished in 2nd place at the contest in Luxembourg, its highest ever placement at the time.
Melodifestivalen 1966 (known as the Svensk sångfinal) was the selection for the eighth song to represent Sweden at the Eurovision Song Contest, held at the Cirkus in Stockholm on 29 January 1966. It was the seventh time that this system of picking a song had been used. 898 songs were submitted to SVT 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 |