Paltiel Philip Birnbaum​ (1904–1988) was an American religious author and translator, best known for his translation and annotation of the prayerbook Ha-Siddur Ha-Shalem ([Complete] Daily Prayer Book), first published in 1949, and widely used in Orthodox and Conservative synagogues until the late 1980s. Birnbaum was born in Kielce, Poland and emigrated to the United States in 1923. He attended Howard College and received his Ph.D. from Dropsie College. He served for several years as the principal of a Jewish day school in Wilmington, Delaware, and directed Jewish schools in Birmingham, Alabama, and Camden, New Jersey. He was a regular columnist and book reviewer for the Hebrew-language weekly, Hadoar. He also served on the board of directors of the Histadrut Ivrit b'America, an American association for the promotion of Hebrew language and culture.