Lionel Dawson-Damer, 4th Earl of Portarlington

Lionel Seymour William Dawson-Damer, 4th Earl of Portarlington (7 April 1832 – 17 December 1892), known as Lionel Dawson-Damer until 1889, was a British peer and Conservative politician.

Background
Portarlington was the only son of the Hon. George Dawson-Damer, younger son of John Dawson, 1st Earl of Portarlington. His mother was Mary Georgiana Emma, daughter of Lord Hugh Seymour.

Political career
Portarlington was returned to Parliament for the Portarlington constituency in 1857, a seat he held until 1865 and again between 1868 and 1880. In 1889 he succeeded his cousin as fourth Earl of Portarlington. However, as this was an Irish peerage he was not allowed to take a seat in the House of Lords.

He was promoted from cornet to lieutenant in the Dorsetshire Yeomanry on 20 April 1858.

Family
Lord Portarlington married the Honourable Harriett Lydia, daughter of Henry Montagu, 6th Baron Rokeby, in 1855. They had several children. He died in December 1892, aged 60, and was succeeded in the earldom by his eldest son, Lionel. Lady Portarlington died in November 1894.