Lieutenant-General Sir Robert William O'Callaghan GCB (October 1777 – 9 June 1840) was a British Army officer and politician.
Born the son of Cornelius O'Callaghan, 1st Baron Lismore, O'Callaghan was commissioned into the 128th Regiment of Foot in 1794.
[1] He served in the Peninsular War and temporarily commanded a brigade within the 2nd Division between January and July 1813 and permanently commanded a brigade of the 2nd Division between February and April 1814.
[1] He served with the Army of Occupation in France and then became Commander-in-Chief, Scotland in 1825 and Commander-in-Chief of the Madras Army in 1831 before retiring in 1836.
[1] He sat in the Irish House of Commons as the Member of Parliament for Bandonbridge from 1798 to 1800.