Synod of the Trinity is an upper judicatory of the Presbyterian Church headquartered in Camp Hill, Pennsylvania.

The synod oversees sixteen presbyteries covering all of Pennsylvania, most of West Virginia, and a portion of eastern Ohio.

The Presbyterian Church in the United States of America has its roots in the territory of the Synod of the Trinity, which was founded as the Synod of Philadelphia in 1717 following the division of the Presbytery of Philadelphia into three presbyteries (Philadelphia, New Castle, and Long Island), with the synod as a superior body.

An advocate of the Great Awakening, Dickinson founded a seminary that later became Princeton University.

"[4] By 1881, the synod consisted of nineteen Pennsylvania counties, the City of Philadelphia, and a portion of western Africa.