Marvil Thomas Shaw III SSJE (August 28, 1945 – October 17, 2014) was an American Episcopal bishop based in New England and a member of the Society of St. John the Evangelist religious order.

In demand nationwide as a preacher, retreat leader and spiritual director, he served in 1993 as chaplain to the House of Bishops of the Episcopal Church.

Shaw was elected bishop coadjutor of the Diocese of Massachusetts on the first ballot at a special diocesan convention held on March 12, 1994, at the Cathedral Church of St. Paul in Boston.

He traveled frequently and led groups to the Holy Land, Africa and Central America, developing and strengthening mission relationships within the Anglican Communion and partnerships to further the church's work of reconciliation and service in the world, with a particular focus on eradication of poverty and disease.

The completion in 2003 of the Barbara C. Harris Camp and Conference Center in Greenfield, New Hampshire, was the result of his vision and leadership toward building strong lay and ordained leadership and ministering to children and young people to bring about their full inclusion in the life of the church, as was his 2008 initiation of a young adult relational evangelism ministry in the Diocese of Massachusetts.