Kirsti Andersen (born December 9, 1941, Copenhagen), published under the name Kirsti Pedersen, is a Danish historian of mathematics. She is an Associate Professor of the History of Science at Aarhus University, where she had her Candidate examination in 1967.
She has also written extensively on the history of graphical perspective. In a 1985 article she related the science of perspective as described by Simon Stevin, Frans van Schooten, Willem 's Gravesande, Brook Taylor, and Johann Heinrich Lambert. In a 1987 article she examined the ancient roots of linear perspective as found in Euclid's Optics and Ptolemy (Geography and Planisphaerium). In 1991 she recalled Desargues’ method of perspective. In 1992 her book on Brook Taylor appeared, and she wrote on the alternative "plan and elevation technique". In 2007 her The Geometry of an Art provided a comprehensive study. According to the publisher’s summary, the book is a "case study of the difficulties in bridging the gap between those with mathematical knowledge and the mathematically untrained practitioners who wish to use this knowledge." The book covers Leon Battista Alberti, Piero della Francesca, Albrecht Dürer, Leonardo da Vinci, Guidobaldo del Monte, and Gaspard Monge as well as the previously mentioned authors.
In 2005 she was awarded a doctorate in Aarhus. She is married to Henk Bos.