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|---|---|---|---|---|
| Major junctions | ||||
| West end | Old Market Street, Bristol | |||
 A4044 A4320 A431 A4017 A4174 A4175 A46 A350 A4 A3102 A419 A417 A415 A338 A34 A4144 A4158 A4142 A40 | ||||
| East end | Headington in Oxford | |||
| Location | ||||
| Country | United Kingdom | |||
| Primary destinations | Chippenham Swindon | |||
| Road network | ||||
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The A420 is a road between Bristol and Oxford in England. Between Swindon and Oxford it is a primary route.