R. Breuer published biblical translations and commentaries on Jeremiah (1914) and Ezekiel (1921); and introductions to R. S. R. Hirsch's Commentary on the Torah (Ger. 2 vols, 1926; Eng. 2 vols, 1948); translations of and commentaries (with text) on the piyyutim for Rosh Ha-Shanah and the Day of Atonement; and wrote Jewish Marriage (Ger. 1923; Eng. 1956). A Jubilee Volume was published in his honor on the occasion of his 80th birthday (Ateret Zevi, Eng. and Heb., 1962, with a bibliography of his writings).