The 1985 RAC Trimoco British Saloon Car Championship was the 28th season of the championship.
Andy Rouse won his third consecutive BSCC championship in a Ford Sierra, making it a record four titles in total.
All races were held in the United Kingdom.
Points were awarded on a 9, 6, 4, 3, 2, 1 basis to the top six finishers in each class, with one bonus point for the fastest lap in each class.
In races where a class had less than four starters, points would be awarded to the top two finishers (6 & 4 respectively) with one point for the fastest lap.