Mar John "Joy" Alappatt (born September 27, 1956) is an Indian-born bishop of the Syro-Malabar Catholic Church in the United States.

He studied for the priesthood at St. Thomas Apostolic Seminary in Vadavathoor, and was ordained a priest for the Syro-Malabar Catholic Eparchy of Irinjalakuda in India on December 31, 1981, by Bishop James Pazhayattil.

In 1993 he was transferred to the United States where he served as a chaplain at the Georgetown University Medical Center where he also completed his clinical pastoral education program.

Alappatt also served in pastoral assignments in New Milford, Newark and Garfield, New Jersey and as the vicar at the Mar Thoma Shleeha Cathedral in Bellwood, Illinois.

[5] On July 20, 2024, Mar Joy Alappatt celebrated the Holy Qurbana at the 10th National Eucharistic Congress with Ukrainian Catholic Archeparchy of Philadelphia Archbishop Borys Gudziak in front of a crowd of 25,000 people including Papal Delegate Cardinal Luis Antonio Tagle and Apostolic Nuncio Cardinal Christophe Pierre[6]