The A145 is an A road in the English county of Suffolk. It runs from east of the town of Beccles, close to the border with Norfolk, to the village of Blythburgh where it joins the A12 road. It is around 11 miles (18 km) in length and single carriageway throughout.

Beccles is a market town and civil parish in the English county of Suffolk. The town is 109 miles (175 km) from London via the A145 and A12 roads, 16 miles (26 km) south-east of Norwich and 33 miles (53 km) north-northeast of Ipswich. Nearby towns include Lowestoft to the east and Great Yarmouth to the north-east. The town lies on the River Waveney on the edge of The Broads National Park.