1946 VFL thirds season

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 −, , , 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.