| 1991 PBA Third Conference | |
|---|---|
| Duration | September 15 – December 15, 1991 |
| TV partner(s) | Vintage Sports (PTV) |
| Finals | |
| Champions | Alaska Milkmen |
| Runners-up | Ginebra San Miguel |
| Awards | |
| Best Import | Wes Matthews (Ginebra San Miguel) |
| PBA Third Conference chronology | |
| PBA conference chronology | |
The 1991 Philippine Basketball Association (PBA) Third Conference was the last conference of the 1991 PBA season. It started on September 15 and ended on December 15, 1991. The tournament allows one import with a height limit of 6'1" each per team.