Jens Jefsen (born 14 April 1946 in Bov, southern Jutland) is a Danish double bassist based in Aarhus. He trained at the Royal Conservatory of Music in Aarhus from 1969 to 1973, and built his reputation accompanying visiting American jazz legends - among them Dexter Gordon, Ben Webster, Dizzy Gillespie and Johnny Griffin - at Jazzhus Tagskægget. With more than sixty years on the double bass and over ten solo albums to his name, he is widely regarded as one of northern Europe's foremost jazz bassists.
On April 14, 2026, Jens Jefsen celebrated his 80th birthday with a concert with Ongoing Tale Band at Elværket Åbyhøj.
Jens Jefsen is listed on the program for Aarhus Jazz Festival 2026 as a participant in a panel.
In January 2025, Jefsen's 11th solo album, "Ongoing Tale", was released on Gateway Music.
In 2025, Jefsen celebrated 60 years as an active bassist and formed a new group with young Aarhus jazz musicians.
In 2022, Jefsen received the honorary award from the Ben Webster Foundation in recognition of more than 50 years of service to jazz.
