Philip Joseph Garrigan (September 8, 1840 – October 14, 1919) was an Irish-born prelate of the Roman Catholic Church who served as the first bishop of the Diocese of Sioux City in Iowa from 1902 to until his death in 1919.

Philip Garrigan was born on September 8, 1840, in the Whitegate, Lisduff, Virginia area of County Cavan, Ireland.

[1] When he was still a boy, Garrigan's family immigrated to the United States, settling in Lowell, Massachusetts.

He received his elementary education in the Lowell public schools, then went to Ellicott City, Maryland to study the classics at St. Charles's College.

[3] In 1916, Garrigan experienced a severe case of food poisoning at a banquet honoring Bishop George Mundelein in Chicago that would affect his health for the rest of his life.