Beit Yosef (Hebrew: בית יוסף) — also transliterated Beth Yosef — is a book by Rabbi Joseph Caro. It is a long, detailed commentary on the Arba'ah Turim. It served as a precursor to the Shulchan Aruch, which Rabbi Caro wrote later in his life.
For more information on this book, see the section Beth Yosef (in the article Shulchan Aruch).