Joseph Hyman Lookstein (Hebrew: יוסף לוקשטיין; December 25, 1902 – July 13, 1979) was a Russian-born American rabbi who served as spiritual leader of Congregation Kehilath Jeshurun on the Upper East Side of Manhattan and was a leader in Orthodox Judaism, including his service as president of the Rabbinical Council of America and of the cross-denominational Synagogue Council of America and New York Board of Rabbis.

Lookstein continued in that role after receiving his ordination, assuming the title of senior rabbi after Margolies's death in 1936.

[3] In 1930, he established the Hebrew Teachers Training School for Girls, now part of Yeshiva University, and served as its principal for ten years.

He was the chief military chaplain of the United States, holding the ceremonial rank of Brigadier General, in the period after World War II.

[2][6] He suffered a stroke in 1979, and died about two weeks later, age 76 on July 13, at Mount Sinai Hospital in Miami Beach, Florida.