Zahid Ismayil oglu Khalilov (Azerbaijani: Zahid Ismayil oglu X?lilov, January 14, 1911, Tbilisi—February 4, 1974, Baku) was an Azerbaijani mathematician (Professor since 1946) and engineer.
Being the founder of Azerbaijani functional analysis school, he was elected President of the Azerbaijan Mathematical Society.
Khalilov solved the boundary value problem for polyharmonic equations, proposed abstract generalizations of singular integral operators and made some other contributions.
In 1955, Khalilov became a member of Azerbaijan National Academy of Sciences.
In 1957—1959 he was its Vice-Chairman and Chairman in 1961–1967.