Bar-Ilan University (BIU, Hebrew: אוניברסיטת בר-אילן, Universitat Bar-Ilan) is a public research university in the Tel Aviv District city of Ramat Gan, Israel. Established in 1955, Bar Ilan is Israel's second-largest academic university institution. It has 20,000 students and 1,350 faculty members.

Bar-Ilan's mission is to "blend Jewish tradition with modern technologies and scholarship and the university endeavors to ... teach the Jewish heritage to all its students while providing [an] academic education." The university is among the best in the Middle East in the fields of computer science, engineering, engineering physics and applied physics. In 2024, the university was donated $260 million, one of the biggest donations to a university in Israeli history, for investment in science. The donor wished to remain anonymous.