Hugh John O'Neill (29 June 1898 – 27 December 1955) was the Roman Catholic coadjutor Bishop of Dunedin (1943–1949).

[2] In 1915 he commenced at Holy Cross seminary and was ordained by Bishop Whyte at St. Joseph's Cathedral, Dunedin on 31 July 1921.

[2] Immediately after ordination, O'Neill was sent to Rome where he studied canon law at the Pontifical Lateran University (the Apollinaris) and resided at the Irish College.

[2] He returned to New Zealand in 1923 and was appointed Professor of Canon Law and Scholastic Philosophy at Holy Cross College, Mosgiel.

[1] His body lay in state at St Joseph's Cathedral until a solemn requiem mass was celebrated on 30 December 1955, attended by all the hierarchy of New Zealand, and a large concourse of clergy and laity[1]