Colonel Robert Hugh Wallace CB CBE PC(Ire) (14 December 1860–23 December 1929) was a British soldier and a lawyer and politician in Northern Ireland.
Wallace was born in Downpatrick, County Down. He was educated at Harrow School and Brasenose College, Oxford. He was called to the bar by the Inner Temple in 1886 and admitted a solicitor of the High Court of Justice of Ireland in 1890. He was Grand Master of the Belfast Orangemen for twenty years and a prominent Freemason and member of the Ulster Unionist Council.
In November 1879 he was commissioned into the Royal South Down Militia (later the 5th Battalion, Royal Irish Rifles). He was promoted Lieutenant in August 1880, Captain in December 1882, Major in December 1892, and Lieutenant-Colonel in January 1898. He commanded the battalion in the Second Boer War, for which he was mentioned in despatches, appointed Companion of the Order of the Bath (CB), and promoted Honorary Colonel in February 1900. He resigned his commission in January 1913, but returned to command the 19th (Reserve) Battalion of the regiment from 1915 to 1917, when he became camp commandant of Donard Lodge Camp, Newcastle, County Down.
He was appointed Commander of the Order of the British Empire (CBE) in 1920 and was appointed to the Privy Council of Ireland in the honours for the opening of the Parliament of Northern Ireland in July 1921, entitling him to the style "The Right Honourable".