List of marginal seats before the 2017 United Kingdom general election

The 2017 United Kingdom general election was called by Prime Minister Theresa May on 18 April that year, and held 51 days later on 8 June. 'Election Polling' marked the following as each of the parties' key target seats, ones that were held by a low margin and could feasibly be won by a different party than in the 2015 election