John Sullivan (8 May 1861 – 19 February 1933) was an Irish Roman Catholic priest and a professed member of the Jesuits. Sullivan was known for his life of deep spiritual reflection and personal sacrifice; he is recognised for his dedicated work with the poor and afflicted and spent much of his time walking and riding his bike to visit those who were troubled or ill in the villages around Clongowes Wood College school where he taught from 1907 until his death.
From the 1920s onwards there were people who testified to his healing power despite the fact that he never claimed credit or causation for himself from these reported cases. Sullivan was known for his friendliness; his amiable nature was coupled with a somewhat shy temperament but one willing to aid those who needed it most. He was noted for his strong faith and for imposing multiple penances on himself such as eating little.