William F. Gannon SJ (March 31, 1859 – October 30, 1916) was an American Catholic priest and Jesuit who was the president of Boston College from 1903 to 1907.

He studied at Boston College High School and entered the Society of Jesus on August 5, 1876, proceeding to the Jesuit novitiate in Frederick, Maryland.

The following year, he went to Maison St-Joseph, the Jesuit novitiate in Sault-au-Récollet (now a neighborhood of Montreal, Canada), where he completed his tertianship.

Gannon sought to expand the college's sports programs, and its intramural baseball team was re-established, but the lack of a gymnasium and a suitable athletic field hindered expansion.

[8] From 1907 to 1908, Gannon engaged in pastoral work at the Church of St. Ignatius Loyola in Manhattan, New York City.

In the summer of 1914, Gannon took up work at the Church of the Gesú in Philadelphia, Pennsylvania, as a confessor and the director of the married men's sodality.