Herman Koeckemann, formally Bernard Hermann Koeckemann (January 10, 1828-February 22, 1892), served as the second vicar apostolic of the Apostolic Vicariate of the Sandwich Islands — now the Roman Catholic Diocese of Honolulu — from 1881 to 1892. Born in Ostbeven, Germany, Koeckemann was ordained to the priesthood as a member of the Congregation of the Sacred Hearts of Jesus and Mary on May 31, 1862 at the age of 34. As a part of his missionary work, Koeckemann sailed to the Kingdom of Hawaii to serve as pastor to the fledgeling Catholic community of native Hawaiians. When Bishop Louis Maigret fell ill, Koeckemann was appointed coadjutor vicar apostolic to fulfill some of the bishop's regular duties. On August 21, 1881, Koeckemann was ordained as a bishop of the titular see of Olba at the age of 53. Upon Maigret's death, Koeckemann was named permanent vicar apostolic on June 11, 1882. He doed in 1892 and was buried at the Catholic Cemetery in downtown Honolulu.