The 2017–18 RFU Junior Vase is the 28th version of the RFU Junior Vase national cup competition (9th using the name RFU Junior Vase) for clubs at level 9 and below of the English rugby union system. The competition consists of 134 clubs divided into four regions. The winners of each region then advance to the national semi-finals with the final being held at Twickenham Stadium in London at the end of the season, along with the RFU Intermediate Cup and RFU Senior Vase finals.