Berenstein is a surname. It is a variant of Bernstein.
People with this surname include: Daniel Emilfork-Berenstein (usually known as Daniel Emilfork), Chilean actor David Berenstein, American physicist Guno Berenstein, Dutch Olympic judoka
See also Hill 400, Bergstein, the site of the former Berenstein Castle Berenstain, a variant often misspelled as Berenstein