Rachel Justine Pries is an American mathematician whose research focuses on arithmetic geometry and number theory.

[5] After her doctoral studies, Pries was appointed a National Science Foundation VIGRE post-doctoral fellow at Columbia University for 2000 to 2003.

In a second highly cited paper, Hyperelliptic curves with prescribed p-torsion,[8] Pries and co-author Darren Glass, proved several results regarding the existence of Jacobian varieties having interesting p-torsion as measured in terms of invariants such as the p-rank and the a-number.

She was an editor of Directions in Number Theory: Proceedings of the 2014 WIN3 Workshop (Association for Women in Mathematics Series), which was published by Springer Verlag in 2016.

[11] In 2004, Pries was selected as Outstanding Professor in Graduate Instruction by the mathematics graduate students of Colorado State University [12] Pries was elected to the 2023 class of fellows of the Association for Women in Mathematics "for supporting the research careers of women through mentorship and advocacy; for her vision and hard work establishing the Women in Numbers workshops and research network; and for broadening the participation of women in mathematics through service and leadership both at her institution and in high-profile national and international programs.