| Country: | TWN |
| Type: | Fwy |
| Route: | 4 |
| Alternate Name: | Taichung Beltway / Taichung Circular Line |
| Length Km: | 28.0 |
| Length Round: | 1 |
| Length Ref: | [1] |
| Established: | 16 November 2001 |
| Direction A: | West |
| Terminus A: | in Qingshui |
| Junction: | in Qingshui in Shengang |
| Direction B: | East |
| Terminus B: | in Tanzi |
| Previous Type: | Fwy |
| Previous Route: | 3 |
| Next Type: | Fwy |
| Next Route: | 5 |
National freeway 4 is a freeway that begins in Qingshui District, Taichung at Provincial Highway 17 and ends in Tanzi District at Provincial Highway 74.
The total length is 28.0 km (17.4 miles).
The lanes in each direction are listed below.
Completed in November 2001.
The Fengshi - Tanzi section was opened on 16 January 2023.