Sholom Reuven Feinstein (Hebrew: שלום ראובן פיינשטיין; born August 1937) is an Orthodox Jewish rabbi and rosh yeshiva of the Yeshiva of Staten Island, New York. He is the younger of Rabbi Moshe Feinstein's two sons, the leading posek of post-war America.

Reuven Feinstein is the youngest of the four children of Rabbi Moshe and Shima (Sima) Feinstein and the only one to be born in America. His older siblings — Faye Gittel (deceased), Shifra (deceased), and Dovid (deceased) were all born in Lyuban, Russia (now part of Belarus), where Rabbi Moshe was the city's Rav until 1937.

Feinstein joined his father in establishing the Yeshiva of Staten Island in 1966. He has served as Rosh Yeshiva (head of school) of the yeshiva ever since. As did his late brother Dovid Feinstein, he upholds their late father's stance against an eruv for Manhattan.

Rabbi Feinstein married Sheila (Chava Sara) Kaplan in the early 1960s. They had four children. She was a public school teacher, then a public school principal, and later on principal of secular studies at a girl's yeshiva. On July 24, 2018, they were involved in a car accident, from which she died on August 8.

In addition to meeting with visitors and handling phone inquiries, Rabbi Feinstein is involved in teaching and providing assistance to members of the broader community.

He authored numerous works on various subjects within Torah literature.

They include:

He gives shiurim (classes) regularly including a popular weekly Chumash Shiur which gets live streamed via https://www.DarcheiSholom.com.