Stephen James Rallis (May 17, 1942 – April 17, 2012) was an American mathematician who worked on group representations, automorphic forms, the Siegel–Weil formula, and Langlands L-functions.

[4] This cornerstone of what Wee Teck Gan et al.[5] term the Rallis program on the theta correspondence has found wide applications.

In 1990, Rallis gave an invited address on his work "Poles of Standard L-functions" at the 1990 International Congress of Mathematicians in Kyoto.

In January, 2015, the Journal of Number Theory published a special issue in honor of Steve Rallis's contributions to mathematics.

[18] His mathematical life was characterized by several long term collaborations with several mathematicians including Stephen Kudla, Herve Jacquet, and Ilya Piatetski-Shapiro.