| State: | WV |
| Type: | WV |
| Route: | 20 |
| Map: | WV 20.png |
| Length Mi: | 256.15 |
| Length Round: | 1 |
| Length Ref: | [1] |
| Direction A: | South |
| Terminus A: | in Bluewell |
| Junction: |
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| Direction B: | North |
| Terminus B: | near New Martinsville |
| Counties: | Mercer, Summers, Fayette, Greenbrier, Nicholas, Webster, Upshur, Barbour, Harrison, Wetzel |
| Previous Type: | US |
| Previous Route: | 19 |
| Next Type: | US |
| Next Route: | 22 |
West Virginia Route 20 is a major north - south state highway in the U.S. state of West Virginia. The southern terminus of the route is at U.S. Route 52 in Bluewell, a small unincorporated suburb of Bluefield. The northern terminus is at West Virginia Route 7 three miles (5 km) east of New Martinsville. WV Route 20 is the longest state route in West Virginia.