Isaac Aboab da Fonseca (or Isaak Aboab Foonseca) (February 1, 1605 – April 4, 1693) was a rabbi, scholar, kabbalist and writer.
In 1656, he was one of several elders within the Portuguese-Israelite community in the Netherlands who excommunicated Baruch Spinoza for the statements this philosopher made concerning the nature of God.