It is affiliated with the Free Church Council, Cytûn (Churches Together in Wales), the European Baptist Federation, and the Baptist World Alliance.

The General Baptist minister Hugh Evans was one of the first Baptists to preach in Wales around 1646, in the parishes of Llan-hir, Cefnllys, Nantmel, and Llanddewi Ystradenny, as well as in districts across the upper Wye Valley in Breconshire.

[1][2] In 1649 John Myles (1621–1683) and Thomas Proud led in the formation of a congregation at Ilston, before Myles emigrated to Swansea, Massachusetts, in 1663.

[3][4] Myles and Proud were connected to the Particular Baptists in London.

[5] According to a census published by the association in 2023, it claimed 8,105 members and 315 churches.