- Source: Ellefsen
- 1001 gram
- Elling
- Daftar Perdana Menteri Kepulauan Faroe
- Optimisasi multiobjektif
- Babak kualifikasi Liga Konferensi Eropa UEFA 2023–2024 (Jalur Utama)
- Babak kualifikasi Liga Konferensi UEFA 2024–2025 (Jalur Utama)
- Babak kualifikasi Liga Konferensi UEFA 2024–2025 (Jalur Juara)
- Metal viking
- Miss World 1987
- Mortiis
- Ellefsen
- Vegard Ellefsen
- 07 Vestur
- Gunnar Ellefsen
- Harald Ellefsen
- Høyer-Ellefsen
- Elias Ellefsen á Skipagøtu
- Ellefsen Harbour
- Per Christian Ellefsen
Ellefsen is a surname. Notable people with the surname include:
Gunnar Ellefsen (1930–1997), Norwegian politician for the Labour Party
Håvard Ellefsen (born 1975), Norwegian electronic musician best known as Mortiis
Harald Ellefsen (born 1950), Norwegian politician for the Conservative Party
Henrik Ellefsen (born 1971), Norwegian businessman
Pauli Ellefsen (1936–2012), Faroese politician and member of the Union Party