American Baptist Churches USA

American Baptist Churches USA
ClassificationMainline Protestant
OrientationBaptist
TheologyMainline
PolityCongregationalism
AssociationsNational Council of Churches;
Baptist World Alliance
RegionUnited States
HeadquartersKing of Prussia, Pennsylvania, U.S.
OriginMay 17, 1907 (1907-05-17) (Reorganization of the Triennial Convention)
Washington, D.C., U.S.
Merger ofTriennial Convention related boards
Free Will Baptist General Conference (1911)
SeparationsGeneral Association of Regular Baptist Churches (1932)
Conservative Baptist Association of America (1947)
Congregations4,892
Members1,107,206
Missionary organizationInternational Ministries
Tertiary institutions16
Seminaries10
Other name(s)Triennial Convention (1814–1907)
Northern Baptist Convention (1907–1950)
American Baptist Convention (1950–1972)
Official websitewww.abc-usa.org

The American Baptist Churches USA (ABCUSA) is a mainline Protestant and Baptist Christian denomination. It is a reorganization from 1907 of the Triennial Convention. The Triennial Convention was renamed as the Northern Baptist Convention in 1907, and renamed again as the American Baptist Convention from 1950 to 1972. Tracing its history to the First Baptist Church in America (1638) and the Baptist Associations which organized the Triennial Convention in 1814, the ABCUSA is headquartered in Valley Forge, Pennsylvania.

Although the denomination is often considered mainline, varying theological and missional emphases may be found among its congregations, including modernist, charismatic and conservative evangelical orientations. In 2025, Pew Research Center published the Religious Landscape Survey, estimating that 1 percent of US adults, or 2.6 million people, self-identify as adherents of the American Baptist Churches USA.