André Sainte-Laguë (, 20 April 1882 – 18 January 1950) was a French mathematician who was a pioneer in the area of graph theory. His research on seat allocation methods (published in 1910) led to one being named after him, the Sainte-Laguë method. Also named after him is the Sainte-Laguë Index for measuring the proportionality of an electoral outcome.