Lisa Sauermann (born 25 September 1992) is a mathematician from Germany known for her performance in the International Mathematical Olympiad, where in 2011 she had the single highest (and perfect) score.

She won the Franz Ludwig Gehe Prize in 2011 and the gold medal in the age group III, the 11th–12th grade competition.

To achieve this, she presented a new mathematical theorem with a proof in a work entitled "Forests with Hypergraphs".

[5] She became a graduate student studying with Jacob Fox at Stanford University where she obtained her PhD in 2019, receiving two prizes for her dissertation titled "Modern Methods in Extremal Combinatorics".

[12] Her sister, Anne, two years her junior, was a successful participant in math and science Olympiads at the national level.