William Augustus Muhlenberg (16 September 1796 – 8 April 1877) was an Episcopal clergyman and educator. Muhlenberg is considered the father of church schools in the United States. An early exponent of the Social Gospel, he founded St. Luke's Hospital in New York City. Muhlenberg was also an early leader of the liturgical movement in Anglican Christianity. His model schools on Long Island had a significant impact on the history of American education. Muhlenberg left his work in secondary education in 1845.
Muhlenberg was born in Philadelphia, Pennsylvania on September 16, 1796. He was a great-grandson of Henry Melchior Muhlenberg (1711–1787, known as the father of Lutheranism in America) and a grandson of Frederick Muhlenberg (1750–1801), a member of the First and Second Continental Congresses and Speaker of the House of Representatives. Muhlenberg was educated at the Philadelphia Academy and the Grammar School of the University of Pennsylvania, graduating from the university in 1815. In 1817 he was ordained a deacon in the Protestant Episcopal Church, becoming assistant to Bishop William White (1748–1836) in the rectorship of Christ Church, St. Peter's and St. James' in Philadelphia. At this time Muhlenberg was influenced by his older friend, Jackson Kemper (1789–1870), who became the first Missionary Bishop of the Protestant Episcopal Church in 1835.