| Official Name: | Gagnef |
| Pushpin Map: | Sweden Dalarna#Sweden |
| Subdivision Type: | Country |
| Subdivision Name: | Sweden |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Gagnef Municipality |
| Subdivision Type2: | County |
| Subdivision Name2: | Dalarna County |
| Subdivision Type1: | Province |
| Subdivision Name1: | Dalarna |
| Area Footnotes: | [1] |
| Area Total Km2: | 2.40 |
| Population As Of: | 13 Mars 2020 |
| Population Total: | 10 328 |
| Population Density Km2: | 437 |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Coordinates: | 60.6°N 20°W |
Gagnef (in Swedish pronounced as /ˈɡâŋːnɛv/)[2] is the second largest locality situated in Gagnef Municipality, Dalarna County, Sweden with 1,049 inhabitants in 2010.Gagnef consists of several small villages: The Church Village, Kyrkbyn, The Station Village, Stationsbyn, Moje, Moje, Tjaerna, Tjärna, Graev, Gräv, Gaersholn, Gärsholm, Gagnefs Grauda, Gagnefs Gråda, Osterfors, Österfors, Vaesterfors, Västerfors, Nordbaeck, Nordbäck, Gagnefsbyn, Gagnefsbyn, Nordauker, Nordåker and Pellesgaurdarna, Pellesgårdarna.
Actress Malin Levanon comes from Gagnef. The artist Ottilia Adelborg lived there for several decades, and there is now an Ottilia Adelborg Museum in Gagnef.
The following sports clubs are located in Gagnef:
Oskar Lindberg (composer) was born in Gagnef.