Lillebjørn Falk Nilsen (born Bjørn Falk Nilsen; 21 December 1950 – 27 January 2024) was a Norwegian singer-songwriter and folk musician.

He was born in Oslo, and was considered by some to be the leading "voice of Oslo", thanks to numerous classic songs about the city from the 1970s and onwards[citation needed].

Nilsen was also a member of the Norwegian supergroup Gitarkameratene with Jan Eggum, Halvdan Sivertsen and Øystein Sunde.

In 1987 he received the Fritt Ord Honorary Award.

[1] Nilsen collaborated with his friend and idol Pete Seeger on numerous occasions.