The 2017–18 FA Vase was the 44th season of the FA Vase, an annual football competition for teams playing below Step 4 of the English National League System. The competition was played with two qualifying rounds preceding the six proper rounds, semi-finals (played over two legs) and final played at Wembley Stadium. All first-leg ties until the semi-finals were played with extra time if drawn after regulation – first-leg ties could also be resolved with penalties if both teams agreed and notified the referee at least 45 minutes before kick-off.