William Sydney Clements, 3rd Earl of Leitrim, was an Anglo-Irish nobleman and landlord notorious in Irish history for his mistreatment of his tenants. He was assassinated in the north of County Donegal in Ireland in April 1878.
- Occupation
- politician
- Position held
- member of the 14th Parliament of the United Kingdom, member of the 13th Parliament of the United Kingdom
- Born
- October 15, 1806
- Died
- April 2, 1878