Nicholas Duncan-Williams (born 12 May 1957) is a Ghanaian religious leader and Independent Charismatic preacher, serving as the presiding Archbishop and General Overseer of the Action Chapel International (ACI) Ministry.

Headquartered in Accra, Ghana, ACI operates globally with affiliates and branch churches in North America, Europe, and Africa.

[3] Duncan-Williams is the founder and President of Prayer Summit International (PSI).

[7] Duncan-Williams is the founder of Dominion University,[8] based in Ghana.

The university's mission is to train a new generation in excellence and ethical leadership for ministry, government, and business.