The Church of the United Brethren in Christ, Old Constitution is that part (a small minority) of the Church of the United Brethren in Christ which withdrew from the larger body in 1889 when the majority group adopted a new constitution. Bishop Milton Wright and a handful of delegates walked out of the General Conference and reconvened nearby as the Church of the United Brethren in Christ, claiming that the other group, by adopting a new constitution, had withdrawn from the denomination.
Until 1946, the two groups were differentiated with a parenthetical "Old Constitution" or "New Constitution". This no longer became necessary when the majority branch merged with the Evangelical Church to form the Evangelical United Brethren Church (which, in 1968, merged into today's United Methodist Church).