Lars Hesselholt (born September 25, 1966) is a Danish mathematician who works as a professor of mathematics at Nagoya University in Japan, as well as holding a temporary position as Niels Bohr Professor at the University of Copenhagen.^[1][2] His research interests include homotopy theory,^[3] algebraic K-theory,^[3] and arithmetic algebraic geometry.^[2]

Hesselholt was born in Vejrumbro, a village in the Viborg Municipality of Denmark.^[1] He studied at Aarhus University, earning a bachelor's degree in 1988, a master's degree in 1992, and a Ph.D. in 1994;^[1] his dissertation, supervised by Ib Madsen, concerned K-theory.^[4] After postdoctoral studies at the Mittag-Leffler Institute, he joined the faculty of the Massachusetts Institute of Technology in 1994 as a C.L.E. Moore instructor, and stayed at MIT as an assistant and then associate professor, before moving to Nagoya in 2008.^[1] Hesselholt's wife is Japanese, and when he joined the Nagoya faculty he became the first westerner with a full professorship in mathematics in Japan.^[2] He is the managing editor of the Nagoya Mathematical Journal.^[5]

Hesselholt became a Sloan fellow in 1998,^[6] and was an invited speaker at the International Congress of Mathematicians in 2002.^[7] In 2012, he became one of the inaugural fellows of the American Mathematical Society,^[8] and a foreign member of the Royal Danish Academy of Sciences and Letters.^[3][9]