Saint Stephen Seminary was a diocesan minor seminary staffed by the Sulpician Fathers in the diocese of Honolulu that closed in 1970.

The seminary land was founded in 1946 when the Diocese of Honolulu obtained the 22-acre (8.9 ha) estate of Harold K.L. Castle, which was built in 1927.^[1] It is located above Maunawili valley in the Koolaupoko district of the island of Oahu. It currently serves as the residence of the bishop of Honolulu. At its peak the seminary accommodated some 70 high school and college students from Guam, other Pacific Islands and the State of Hawaii.

The seminary flourished in the 1950s and 1960s, but dwindled and closed in the early 1980s.^[2] After the seminary's closure, the Cullinan Building was transformed into a diocesan center housing various officers of the diocesan curia. Since the episcopate of Msgr. John Scanlan, the seminary grounds have also housed a Carmelite monastery of discalced nuns from Hong Kong.

Currently, candidates for priestly formation in the Diocese of Honolulu attend the metropolitan seminaries of Saint Joseph in Mountain View, California, and Saint Patrick in Menlo Park, California.

Prior to his elevation to the episcopate as auxiliary bishop of Honolulu, Msgr. Joseph Ferrario, was a professor of Greek and Latin at Saint Stephen's. Among his many students was Roman Catholic deacon and Hawaiian comedian, Frank Delima, known for his sardonic portrayal of a fictitious Roman prelate, Monsignor Vermicelli.

• Roman Catholic Diocese of Honolulu

v t e Roman Catholic Diocese of Honolulu
Ordinaries	Prefect Apostolic of the Sandwich Islands Alexis Bachelot Vicars Apostolic of the Hawaiian Islands Louis Désiré Maigret Herman Koeckemann Gulstan Ropert Libert H. Boeynaems Stephen Alencastre Bishops of Honolulu James Joseph Sweeney John Joseph Scanlan Joseph Anthony Ferrario Francis X. DiLorenzo Clarence Richard Silva
Churches	Cathedrals Cathedral Basilica of Our Lady of Peace Co-Cathedral of Saint Theresa of the Child Jesus Parishes St. Mary Church, Hana Sacred Heart Church-Punahou Saint John the Baptist Church Most Sacred Heart of Jesus Church, Hawi St. Joseph Church, Hilo Holy Trinity Church, Honolulu Our Lady of the Mount Church, Honolulu St. Anthony Church, Honolulu St. Augustine by the Sea Church, Honolulu St. Patrick Church, Honolulu Saints Peter and Paul Church, Honolulu St. Michael the Archangel Church, Kailua-Kona Star of the Sea Church, Kalapana St. Ann Church, Kaneohe St. Theresa Church, Kekaha St. Raphael Church, Koloa Our Lady Queen of Angels Church, Kula Holy Ghost Church, Kula Maria Lanakila Catholic Church, Lahaina Immaculate Conception Church, Lihue St. Joseph Church, Makawao Our Lady of Good Counsel Church, Pearl City Resurrection of the Lord Church, Waipahu St. Benedict's Church, Honaunau
Education	Higher education Chaminade University of Honolulu High schools Damien Memorial School, Honolulu Maryknoll School, Honolulu Sacred Hearts Academy, Honolulu St. Francis School, Honolulu St. Louis School, Honolulu St. Anthony School, Wailuku St. Joseph School, Hilo
Priests	Lane K. Akiona Marc R. Alexander Maximin Alff Abraham Armand St. Damien de Veuster Charles Kekumano Francis A. Marzen Columba Murphy Jules C. E. Riotte Patrick Short John M. Systermans Benedict M. Vierra Arsenius Walsh
Miscellany	Hawaii Catholic Herald Malia O Ka Malu St. Marianne Cope
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