The Batley and Spen by-election was a UK parliamentary by-election held on 20 October 2016 in the constituency of Batley and Spen. It was triggered by the murder of the incumbent member of parliament (MP), Jo Cox, on 16 June 2016. The Labour candidate, Tracy Brabin, won with 85.8% of the vote. Four parties with parliamentary representation did not enter candidates, out of respect for Cox. Nine candidates contested against Labour, and none reached the 5% threshold to keep their deposit.