Arsenius Walsh, SS.CC., (1804 – 14 October 1869), was an Irish Catholic priest who was among the first Roman Catholic missionaries in the Kingdom of Hawaii. He was a member of the Congregation of the Sacred Hearts of Jesus and Mary, a religious institute based in Paris, better known as the "Picpus Fathers", which had been founded during the turmoil of the French Revolution. He is called the Apostle of Hawaii.