| Old Montagnais | |
| Region: | Quebec, Labrador |
| Era: | Developed into Innu |
| Familycolor: | Algic |
| Fam1: | Algic |
| Fam2: | Algonquian |
| Fam3: | Cree-Montagnais-Naskapi[1] |
| Isoexception: | historical |
| Glotto: | none |
Old Montagnais is the period in the history of the Innu-aimun language preceding its current form.
There are several sound changes that Old Montagnais underwent. One example is the change from Old Montagnais ayaškimew to modern Innu ayassimēw.