North Monaghan by election, 1886

The North Monaghan by-election, 1886 was a parliamentary by-election held for the United Kingdom House of Commons constituency of North Monaghan on 10 February 1886. Tim Healy of the Irish Parliamentary Party had won the seat in the general election of 1885, but having been elected also in South Londonderry, he chose to sit for the latter. The North Monaghan seat thus became vacant, and in the ensuing by-election, Patrick O'Brien of the Irish Parliamentary Party was elected, defeating his Conservative opponent, Dr Hall, by 4,015 votes to 2,551, a slightly increased majority from the general election.