There are several notable people with the surname Orenstein.
Alexander Jeremiah Orenstein, South African medical scientist and army general
Henry Orenstein, American poker player and entrepreneur
Henry Orenstein (painter), Canadian artist
Joan Orenstein, Canadian actress
Leo Orenstein, Canadian television producer and director
Peggy Orenstein, American writer
Walter Orenstein, American vaccinologist
Zigu Ornea (born Orenstein or Ornstein), Romanian cultural historian
