Alexander A. Its (b. 1952 in St. Petersburg, Russia) is Professor of Mathematics in the Department of Mathematical Sciences of Indiana University—Purdue University, Indianapolis.

Current research areas of Its are mathematical physics, special functions, and integrable systems.

Books by Its are The Isomonodromic Deformation Method in the Theory of Painlevé Equations (with V. Y. Novokshënov), published by Springer in 1986, Algebro-geometric Approach to Nonlinear Integrable Problems (with E. D. Belokolos, A. I. Bobenko, V. Z. Enol’skii, and V. B. Matveev), published by Springer in 1994, and Painlevé Transcendents: The Riemann-Hilbert Approach (with A. S. Fokas, A. A. Kapaev, and V. Y. Novokshënov), published by the American Mathematical Society in 2006.

Its served as a Validator for the original release and publication in May 2010 of the NIST Digital Library of Mathematical Functions and the NIST Handbook of Mathematical Functions.