Timothy G. O’Connell (1868–1955) was an American architect whose Boston-based practice specialized in ecclesiastical design.

Peter and Paul in Lewiston, Maine would rival any medieval cathedral in form and scale.

The first building that O’Connell designed was a church in Twin Mountain, New Hampshire (1890).

At one time Chickering and O'Connell employed up to 60 draftsmen, and they designed churches for the Episcopal denomination as well as Catholics.

The new firm, known as O’Connell and Shaw, was located in Boston and lasted for six years.