Helena Judith Nussenzveig Lopes is a Brazilian mathematician, known for her work on the Euler equations for incompressible flow in fluid dynamics.
She is a professor titular in the Department of Mathematical Methods at the Federal University of Rio de Janeiro.
Her dissertation, An Estimate of the Hausdorff Dimension of a Concentration Set for the 2D Incompressible Euler Equations, was jointly supervised by Ronald DiPerna and Lawrence C.
She moved to the Federal University of Rio de Janeiro as a full professor in 2012, and headed the department of mathematics there from 2014 to 2016.
Shechaired the Society for Industrial and Applied Mathematics Activity Group on Analysis of Partial Differential Equations for 2015–2016.