Well, to make a long story short, Baruch Spinoza was Jewish!
Since Baruch Spinoza's mother was Jewish, and in Orthodox Judaism and Conservative Judaism, those with a Jewish mother (or those who underwent a halakhic conversion) are considered Jewish, then that makes him Jewish. His father was Jewish too.
Baruch Spinoza was born on 24 November 1632 in Amsterdam, Dutch Republic. Baruch Spinoza passed away on 21 February 1677 (aged 44).
The breadth and importance of Spinoza's work was not fully realized until years after his death. By laying the groundwork for the 18th century Enlightenment and modern biblical criticism, including modern conceptions of the self and, arguably, the universe, he came to be considered one of the great rationalists of 17th-century philosophy.
If you see any details that require update, please Let us know!