Lisa Lorentzen (born 1943[1], also published as Lisa Jacobsen) is a Norwegian mathematician known for her work on continued fractions. She is a professor emerita in the Department of Mathematical Sciences at the Norwegian University of Science and Technology (NTNU).
With, Lorentzen is the author of the book Continued Fractions with Applications (Studies in Computational Mathematics 3, North-Holland, 1992; 2nd ed., Atlantis Studies in Mathematics for Engineering and Science, Springer, 2008).
She is also the author of two textbooks in Norwegian: Kalkulus for ingeniører [Calculus for engineers] and [What is mathematics?], and co-author with Arne Hole and Tom Louis Lindstrøm of Kalkulus med én og flere variable [Calculus with single and multiple variables].
Lorentzen is a member of the Royal Norwegian Society of Sciences and Letters.She was the 1986 winner of the academic prize of the Royal Norwegian Society of Sciences and Letters.