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| Route information | ||||
| Maintained by NZ Transport Agency | ||||
| Length | 231 km (144 mi) | |||
| Tourist routes | Great Alpine Highway Christchurch Ring Road Inland Scenic Route between Sheffield and Waddington. | |||
| Major junctions | ||||
| Northwest end |  SH 6 at Kumara Junction | |||
| Southeast end |  SH 75 (Curletts Road)/ SH 76 (Christchurch Southern Motorway) at Middleton, New Zealand | |||
| Location | ||||
| Country | New Zealand | |||
| Primary destinations | Kumara, Dillmanstown, Jacksons, Otira, Arthur's Pass, Bealey, Cass, Castle Hill Village, Springfield, Sheffield, Waddington, Darfield, Kirwee, Aylesbury, West Melton, Yaldhurst, Christchurch | |||
| Highway system | ||||
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State Highway 73 (SH 73) is a major east-west South Island state highway in New Zealand connecting Christchurch on the east coast with Cass/Hokitika via the Southern Alps. It is mostly two lane, with some single-lane bridges north of Springfield but is mostly dual carriageway in Christchurch. The fourth and fifth-highest points of New Zealand's state highway network are on this road at Porters Pass and Arthur's Pass respectively.