The Presbyterian Church in the United States was a Protestant denomination in the Southern and border states of the United States that existed from 1861 to 1983. That year, it merged with the United Presbyterian Church in the United States of America (UPCUSA) to form the Presbyterian Church (USA).

The Presbyterian Church (USA), abbreviated PCUSA, is a mainline Protestant denomination in the United States. It is the largest Presbyterian denomination in the country, known for its progressive stance on doctrine and its ordaining of women and members of the LGBT community as elders and ministers. The Presbyterian Church (USA) was established with the 1983 merger of the Presbyterian Church in the United States, whose churches were located in the Southern and border states, with the United Presbyterian Church in the United States of America, whose congregations could be found in every state.