The 2025 TSS Thailand Super Series was the twelfth season of the Thailand Super Series, a South-East Asian sports car racing series organised by the TSS and with the partnership alongside SRO Motorsports Group. The season started on 23 May at Chang International Circuit and finished on 2 November, also at Chang International Circuit. The races were contested with GT3-spec, GT Cup-spec and GT4-spec cars.
Championship points are awarded for the first ten positions in each race. Entries are required to complete 75% of the winning car's race distance in order to be classified and earn points.