Lionel Seymour William Dawson-Damer, 4th Earl of Portarlington DL, known as Lionel Dawson-Damer until 1889, was a British peer and Conservative politician.
- Occupation
- politician
- Position held
- member of the 21st Parliament of the United Kingdom, member of the 20th Parliament of the United Kingdom, member of the 18th Parliament of the United Kingdom, member of the 17th Parliament of the United Kingdom
- Born
- 1832, April 7, 1832
- Died
- 1892, December 17, 1892
