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Lag BaOmer (), also known as Lag LaOmer amongst Sephardi Jews, is a Jewish holiday celebrated on the thirty-third day of the Counting of the Omer, which occurs on the 18th day of the Hebrew month of Iyar.

According to the Talmud and Midrash, this day marks the hillula ( celebration, interpreted by some as anniversary of death ) of Rabbi Shimon bar Yochai, a Mishnaic sage and leading disciple of Rabbi Akiva in the 2nd century, and the day on which he revealed the deepest secrets of kabbalah in the form of the Zohar, a landmark text of Jewish mysticism.

In modern Israel, Zionist ideology redefined Lag BaOmer as a nationalist holiday, connecting it to the Bar Kokhba revolt against the Roman Empire.