Baruch or Benedict de Spinoza (Portuguese: Bento de Espinosa, Latin: Benedictus de Spinoza) (November 24, 1632 – February 21, 1677) is a Dutch philosopher of Portuguese Jewish origin.

Revealing considerable scientific aptitude, the breadth and importance of Spinoza's work is not fully realized until years after his death.

Today, he is considered one of the great rationalists of 17th-century philosophy, laying the groundwork for the 18th century Enlightenment and modern biblical criticism.

By virtue of his magnum opus, the posthumous Ethics, in which he opposes Descartes' mind–body dualism, Spinoza is considered to be one of Western philosophy's most important philosophers.

Philosopher and historian Georg Wilhelm Friedrich Hegel said of all modern philosophers, "You are either a Spinozist or not a philosopher at all."

Though Spinoza is active in the Dutch Jewish community and extremely well-versed in Jewish texts, his controversial ideas eventually lead community leaders to issue a cherem (a kind of excommunication) against him, effectively dismissing him from Jewish society at age 23.

All of Spinoza's works are listed on the Index Librorum Prohibitorum (List of Prohibited Books) by the Roman Catholic Church.

Spinoza lives quietly as a lens grinder, turning down rewards and honors throughout his life, including prestigious teaching positions, and gives his family inheritance to his sister.

Spinoza's moral character and philosophical accomplishments prompted 20th century philosopher Gilles Deleuze to name him "the 'prince' of philosophers."

Spinoza dies at the age of 44 of a lung illness, perhaps tuberculosis or silicosis exacerbated by fine glass dust inhaled while plying his trade.

Spinoza is buried in the churchyard of the Nieuwe Kerk on Spui in The Hague.