Gábor Szegő (January 20, 1895 - August 7, 1985) was a Hungarian mathematician.

Szegő was born in Kunhegyes , Hungary. His most important work centered around Toeplitz matrices and orthogonal polynomials. He was a teacher of János von Neumann. His book Orthogonal polynomials published in 1939 is a classic within its field and is still widely used as a reference in polynomial theory.

He died in Palo Alto, California, USA.