Donal O'Callaghan (23 June 1891 – 12 September 1962)[1] was an Irish Sinn Féin politician and Lord Mayor of Cork from 1920 to 1924.

[2] He was the third Lord Mayor of Cork in 1920, after the assassination of Tomás Mac Curtain by the Irish Constabulary in January 1920, and the death on hunger strike of Terence MacSwiney in October 1920.

[3] After the Burning of Cork in December 1920, O'Callaghan who had received death threats, fled to America as a stowaway on board the steamship, West Cannon.

He was arrested on arrival in the US but eventually freed, and spent the next eight months there where delivered a series of speeches and helped to secure a loan for Dáil Éireann, acting as the emissary of Michael Collins.

[6] In June 1923, Éamon de Valera appointed O'Callaghan as the Republican envoy to the US, replacing Laurence Ginnell.