Rehuel Lobatto (June 6, 1797 – February 9, 1866) was a Dutch mathematician. Lobatto was born in Amsterdam to a Portuguese Marrano family. As a schoolboy Lobatto already displayed remarkable talent for mathematics. He studied mathematics under Adolphe Quetelet coediting "Correspondance Mathématique et Physique." Working for the Dutch government he became secretary of a statistical commission in 1831. In 1836 he became member of the Royal Institute, predecessor of the Royal Netherlands Academy of Arts and Sciences. In 1842 he became a teacher at the Polytechnical School of Delft.
The Gauss-Lobatto quadrature method is named after him.