Meir Simcha of Dvinsk (1843–1926) was a rabbi and prominent leader of Orthodox Judaism in Eastern Europe in the early 20th century. He was a kohen, and is therefore often referred to as Meir Simcha ha-Kohen. He is known for his writings on Maimonides' Mishneh Torah, which he titled Ohr Somayach, as well as his novellae on the Torah, titled Meshech Chochma.

The Mishneh Torah, also known as Sefer Yad ha-Hazaka, is a code of Rabbinic Jewish religious law (halakha) authored by Maimonides. The Mishneh Torah was compiled between 1170 and 1180 CE, while Maimonides was living in Egypt, and is regarded as Maimonides' magnum opus. Accordingly, later sources simply refer to the work as "Maimon", "Maimonides", or "RaMBaM", although Maimonides composed other works.