John Joseph Scanlan (May 24, 1906-January 31, 1997) was the second Bishop of the Roman Catholic Diocese of Honolulu in the United States.
Born in Iniscarra in County Cork, Ireland, Scanlan was ordained a priest on June 22, 1930 for the Archdiocese of San Francisco.
On July 8, 1954, Scanlan was appointed Auxiliary Bishop of Honolulu and Titular Bishop of Cenae. On September 21 of that year, Scanlan's episcopal consecration took place. On November 10, 1967, Scanlan was appointed Apostolic Administrator of Honolulu and took charge of the administration of the diocese.
On March 6, 1968, he was appointed the Bishop of the Diocese of Honolulu. On June 30, 1981, Scanlan retired but continued to be active as Bishop Emeritus. He died in California on January 31, 1997 and was buried in the crypt at the Cathedral of Our Lady of Peace alongside the remains of missionary Bishop Louis Maigret.
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| Preceded by James Joseph Sweeney |
Bishop of Honolulu 1968–1981 |
Succeeded by Joseph Anthony Ferrario |