Howell Harris was a Calvinistic Methodist evangelist. He was one of the main leaders of the Welsh Methodist revival in the 18th century, along with Daniel Rowland and William Williams Pantycelyn.

The Welsh Methodist revival was an evangelical revival that revitalised Christianity in Wales during the 18th century. Methodist preachers such as Daniel Rowland, William Williams and Howell Harris were heavily influential in the movement. The revival led eventually to the establishment of the Welsh Calvinistic Methodists as a denomination and it also revitalised older dissenting churches.