Henry Dawson Damer, 3rd Earl of Portarlington

Henry John Reuben Dawson-Damer, 3rd Earl of Portarlington (5 September 1822 – 1 March 1889) was an Irish peer.

On 17 November 1841, he was commissioned a cornet in the Dorsetshire Yeomanry. He became Earl of Portarlington in 1845 on the death of his uncle John Dawson, 2nd Earl of Portarlington and resigned his Yeomanry commission in November 1848. The Earl was appointed a Knight of the Order of St Patrick on 8 February 1879.