Lord Otho Augustus FitzGerald PC (10 October 1827 – 19 November 1882) was a British soldier and Liberal politician.

He was the third son of Augustus FitzGerald, 3rd Duke of Leinster, by his wife Lady Charlotte Augusta Stanhope.

His sister, Lady Jane Seymour FitzGerald, was the wife of George Repton, an MP for St Albans[3] and Warwick.

[1][7] In 1866 he was sworn of the Privy Council[8] and made Treasurer of the Household under Lord Russell,[9] a post he only held until the fall of the Liberal government in June of that year.

[citation needed] They had two children:[15] Fitzgerald for a while owned Oakley Court on the Thames, at Bray in Berkshire.