Eve Oja (10 October 1948 – 27 January 2019) was an Estonian mathematician specializing in functional analysis.

Oja was born in Tallinn and studied at the Tartu State University (now the University of Tartu), completing her undergraduate studies in 1972 and earning a doctorate (Cand.Sc.)

[1] Her dissertation, Безусловные шаудеровы разложения в локально выпуклых пространствах (Unconditional Schauder decompositions in locally convex spaces) was supervised by Gunnar Kangro.

She served several terms as head of the Institute of Pure Mathematics at the university, and from 2009-15 she headed the Estonian School of Mathematics and Statistics.

[4] She was editor-in-chief of the mathematics journal Acta et Commentationes Universitatis Tartuensis de Mathematica since 1998.