Arthur Henry John Walsh, 3rd Baron Ormathwaite GCVO (10 April 1859 – 13 March 1937) was a British Army officer, politician, peer and courtier. Walsh was the eldest son of the 2nd Baron Ormathwaite and his wife, Katherine, a daughter of the 7th Duke of Beaufort. He was educated at Eton College. In 1876 he was commissioned a Sub-Lieutenant in the Royal South Wales Borderers Militia, and promoted to lieutenant later the same year. In 1878 he transferred to the Regular Army as a second lieutenant in the 1st Life Guards and was later promoted to lieutenant. In 1887 he left the Regular Army and became a second lieutenant in the Royal East Kent Yeomanry, serving until 1890.