| Country: | TWN |
| Type: | PH |
| Route: | 86 |
| Established: | 30 December 1999 |
| Alternate Name: | 台南關廟線 (Tainan-Guanmiao Expressway) |
| Length Km: | 20 |
| Map: | TW_PHW86route.svg |
| Direction A: | West |
| Terminus A: | in South District, Tainan City |
| Junction: | in Rende, Tainan City |
| Direction B: | East |
| Terminus B: | in Guanmiao, Tainan City |
| Previous Type: | PH |
| Previous Route: | 84 |
| Next Type: | PH |
| Next Route: | 88 |
Provincial Highway 86 is an expressway, which begins in South District, Tainan on Provincial Highway No. 17 and ends in Guanmiao District, Tainan on National Highway No. 3 in Taiwan.
The total length is 20 km.
The entire route is within Tainan City.