Jacob Golius, born Jacob van Gool (1596 – September 28, 1667), was an Orientalist and mathematician based at the Leiden University in the Netherlands. He is primarily remembered as an Orientalist. He published Arabic texts in Arabic at Leiden, and did Arabic-to-Latin translations. His best-known work is an Arabic-to-Latin dictionary, Lexicon Arabico-Latinum (1653), which he sourced for the most part from the Sihah dictionary of Al-Jauhari and the Qamous dictionary of Fairuzabadi.