The 1946 VFL thirds season was the inaugural season of the VFL thirds, the Australian rules football competition operating as the junior competition to the Victorian Football League (VFL).
Only 7 of the 12 VFL clubs with senior teams fielded a thirds side in the inaugural season â , , , and did not compete. Several VFL clubs already operated thirds teams in local competitions, while others were affiliated with existing junior clubs.
won the first grand final, defeating Carlton.