The Catalpa rescue was the escape, on 17–19 April 1876, of six Irish Fenian prisoners from the Convict Establishment, a British penal colony in Western Australia. They were taken on the convict ship Hougoumont to Fremantle, Western Australia, arriving 9 January 1868. In 1869, pardons had been issued to many of the imprisoned Fenians. Another round of pardons was issued in 1871, after which only a small group of "military" Fenians remained in Western Australia's penal system.

The word Fenian served as an umbrella term for the Irish Republican Brotherhood (IRB) and their affiliate in the United States, the Fenian Brotherhood. They were secret political organisations in the late 19th and early 20th centuries dedicated to the establishment of an independent Irish Republic. In 1867 they sought to coordinate raids into Canada from the United States with a rising in Ireland. In the 1916 Easter Rising and the 1919–1921 Irish War of Independence, the IRB led the republican struggle.