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|---|---|---|---|---|
| Route information | ||||
| Maintained by the eThekwini Metropolitan Municipality | ||||
| Length | 17 km (11 mi) | |||
| Major junctions | ||||
| North end |  M25 in KwaMashu | |||
 M5 in Newlands West
 R102 in Umgeni Park, Durban | ||||
| South end |  M4 in Durban North, Durban | |||
| Location | ||||
| Country | South Africa | |||
| Towns | KwaMashu, Newlands West, Durban | |||
| Highway system | ||||
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The M21 is a metropolitan route in the eThekwini Metropolitan Municipality, South Africa linking Durban with Phoenix via Newlands West and KwaMashu.