Provincial Highway 84 (Chinese: 台84線) is an expressway, which begins in Beimen, Tainan on the Provincial Highway No.

61 and ends in Yujing, Tainan on Zhongshan Road (Provincial Highway No.

A short section in Beimen, Tainan between National Highway No.

It functions as a feeder to National Highway No.

The entire route is within Tainan City.