The 2025 GT4 Winter Series was the second season of GT4 Winter Series. It started on 16 January 2025 in Circuito do Estoril and finished on 9 March in Circuit de Barcelona-Catalunya.
Bold indicates overall winner.
For overall classification top 10 gets points, from 25 points for 1st place, to 1 point for 10th place.
In class classifications number of points awarded to the competitors is based on the number of entrants in that class.