Ulrike Luise Tillmann FRS is a mathematician specializing in algebraic topology, who has made important contributions to the study of the moduli space of algebraic curves. She is titular Professor of Mathematics at the University of Oxford and a Fellow of Merton College, Oxford. In 2021 she was appointed Director of the Isaac Newton Institute at the University of Cambridge, and N.M. Rothschild & Sons Professor of Mathematical Sciences at Cambridge, but continued to hold a part-time position at Oxford.