William Ulick Tristram St Lawrence, 4th Earl of Howth KP was an Irish peer, styled Viscount St Lawrence until 1874. He became Earl of Howth in 1874 on the death of his father, Thomas St Lawrence, 3rd Earl of Howth, and was appointed a Knight of the Order of St Patrick on 8 May 1884. His mother was Thomas's first wife Lady Emily de Burgh, daughter of John de Burgh, 13th Earl of Clanricarde.
- Occupation
- politician
- Position held
- member of the 20th Parliament of the United Kingdom, member of the 21st Parliament of the United Kingdom, member of the House of Lords
- Citizenship
- United Kingdom of Great Britain and Ireland
