Chaim Ozer Grodzinski

Chaim Ozer Grodzinski (; August 24, 1863 – August 9, 1940) was a Av beis din (rabbinical chief justice), posek (halakhic authority), and Talmudic scholar in Vilnius, Lithuania in the late 19th and early 20th centuries for over 55 years. in Iwye, Belarus, a small town near Vilnius. His father, David Shlomo Grodzinski, was rabbi of Iwye for over 40 years, He was a participant in the founding conference of Agudath Israel (in Kattowitz, Silesia, in 1912) and served on the party's Council of Sages. He also was a co-founder and active leader of the Va'ad ha-Yeshivot (Council of the Yeshivot), Grodzinski was the first chairman of the Moetzes Gedolei Torah, the rabbinical advisory board to the Agudah.

Death Grodzinski died of cancer on 9 August 1940 (5 Av 5700).

Works Grodzinski's halachic opinion was highly regarded among the rabbis of his generation. His best known work is "Achiezer" a collection of his "shutim" (responsa). The work is known for its lengthy discussions centered on analysis as opposed to final ruling. In this work he often quotes Rabbi Akiva Eiger. Other works include two collections of correspondences by Rabbi Grodzinski on more general communal and Hashkafic matters.