Hubertus Cornelis Antonius Ernst (8 April 1917 – 19 May 2017) was a Dutch prelate of the Roman Catholic Church.

Ernst, at the time vicar-general of the Diocese of Breda, was appointed bishop of the same Diocese on 3 November 1967 after the sudden death of his predecessor, Gerardus Henricus De Vet; he was consecrated by Cardinal Bernard Alfrink on 17 December the same year.

[2] In 1976 the Dutch Catholic Peace Movement, Pax Christi, asked Ernst to be the next president of the organisation, becoming Alfrink's successor.

Ernst, former Professor of Moral Theology at the Diocesan Seminary, had always cherished strong views on for instance nuclear pacifism.

In his opinion such views contradicted the moral teaching of the Catholic Church as has been said in § 112 of the encyclical Pacem in terris of Pope John XXIII.