The 2018 Watford Borough Council election took place on 3 May 2018 to elect members of Watford Borough Council in England. This was the same day as other local elections. Watford was one of the boroughs subject to a trial of voter ID restrictions requiring the production of polling cards. Since the election of the full council in 2016, there had been three by-elections, but the balance of the council remained the same, as they were won by the defending party, in the case of Leggatts Ward by Labour and in the cases of Oxhey and Park by the Lib Dems.