Portrush Road is a major part of National Route A17, a bypass route in Adelaide, the capital of South Australia.

It runs north-south through the south-eastern and eastern suburbs of Adelaide, at the foot of the Adelaide Hills. The southern end is at the beginning of National Route M1, the Adelaide-Crafers Highway (the major route from Melbourne and the south-east of South Australia), which is also the intersection with the south-eastern ends of Cross Road (State Route A3) and Glen Osmond Road (State Route A1).

Portrush Road extends north from there to Payneham Road (State Route A11), crossing the four major arterial routes from the south-eastern and eastern suburbs into the city: Greenhill Road, Kensington Road, The Parade and Magill Road.

A17

At Payneham Road, the A17 turns north-west and changes name to Lower Portrush Road. As it crosses the River Torrens, it changes name to Ascot Avenue. At the intersection with North East Road (State Route A10), it changes name to Taunton Road. At the end of Taunton Road, it turns north again and changes name to Hampstead Road, continuing north and terminating at the intersection with Grand Junction Road, (National Route A16).

The A17 (Portrush Road - Hampstead Road) and the A16 (Grand Junction Road) constitute the major heavy road transport route through suburban Adelaide from Port Adelaide and anywhere north of Adelaide to the South East of South Australia and the adjacent state of Victoria.

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