The Western Regions Trial Series (WRTS) was an annual competition comprising events run by clubs in the western half of Victoria and Mt Gambier in South Australia plus the Peugeot Car Club of Victoria. It ran from 19? to ? inclusive.

In 1988, the clubs involved were the Light Car Club of Australia, both Ballarat and Bendigo branches,  Castlemaine Car Club, Hamilton & Districts Car Club, Peugeot Car Club of Victoria, Central Victorian Car Club, South East Auto Club, Geelong Motorsports Club and the Western District Car Club.