County Sligo is a former county constituency in Ireland, represented in the House of Commons of the Parliament of the United Kingdom.
After the Sligo and Cashel Disfranchisement Act 1870, the borough ceased to have separate representation, and eligible voters were added to the roll for the county constituency.
Perceval was appointed a commissioner of the Treasury, causing a by-election.
Ffolliott resigned by accepting the office of Steward of the Chiltern Hundreds, causing a by-election.
Gore-Booth's death caused a by-election.