The Catalpa rescue was the escape, on 17–19 April 1876, of six Irish Fenian prisoners from the Convict Establishment (now Fremantle Prison), 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.
In 1874, prisoner James Wilson secretly sent a letter to New York City journalist John Devoy, who worked to organize a rescue. Using donations collected by Devoy from Irish-Americans, Fremantle escapee John Boyle O'Reilly, then living in Boston, purchased a merchant ship, Catalpa, and sailed her to international waters off Rockingham, Western Australia. On 17 April 1876 at 8:30 am, Wilson and five other Fenians working outside the prison walls, Thomas Darragh, Martin Hogan, Michael Harrington, Thomas Hassett, and Robert Cranston, boarded a whaleboat O'Reilly had dispatched, were taken aboard Catalpa, and escaped to New York.