The A178 is a road that runs from Hartlepool in County Durham to Middlesbrough in North Yorkshire, England.

It runs east as Church Street passing Hartlepool railway station.

At the end of Church Street, it turns right and runs south as Mainsforth Terrace until it passes the bridge over the Durham Coast Line then runs as Coronation Drive passing along the Hartlepool to Seaton Carew promenade.

[1] It passes the A1185 roundabout and the Saltholme nature reserve as Seaton Carew Road.

The Middlesbrough Transporter Bridge may be closed at times and as an alternative route drivers should turn right on the A1046 through Port Clarence and Haverton Hill then turn left on the A1032 over the River Tees on the Tees Newport Bridge.