1946 VFL thirds season
| 1946 VFL thirds season | |
|---|---|
| Date | 3 May – 21 September | 
| Teams | 7 | 
| Premiers | North Melbourne 1st premiership  | 
| Minor premiers | Melbourne 1st minor premiership  | 
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 − Collingwood, Fitzroy, Footscray, Geelong and South Melbourne did not compete. Several VFL clubs already operated thirds teams in local competitions, while others were affiliated with existing junior clubs.
North Melbourne won the first grand final, defeating Carlton.