Philip William Otterbein was an American clergyman. He was the founder of the United Brethren in Christ, which merged with the Evangelical Church in 1946 to form the Evangelical United Brethren Church. That church merged with the much larger Methodist Church in 1968, forming the United Methodist Church.

The Church of the United Brethren in Christ is an evangelical Christian denomination with churches in 17 countries. It is Protestant, with an episcopal structure and Arminian theology, with roots in the Mennonite and German Reformed communities of 18th-century Pennsylvania, as well as close ties to Methodism. It was organized in 1800 by Martin Boehm and Philip William Otterbein and is the first American denomination that was not transplanted from Europe. It emerged from United Brethren churches that were at first unorganized, and not all of which joined this church when it was formally organized in 1800, following a 1789 conference at the Otterbein Church.