The 1886 Flintshire by-election was a parliamentary by-election held for the UK House of Commons constituency of Flintshire in Wales on 2 March 1886.
The by-election was caused by the resignation of the sitting Liberal MP, Richard Grosvenor who was appointed a Steward of the Chiltern Hundreds and then to the House of Lords.
Two candidates were nominated.
The Liberal Party nominated businessman Samuel Smith.
The Conservative Party nominated Justice of the Peace Philip Pennant Pennant.