The A146 is an A road that connects Norwich in Norfolk and Lowestoft in Suffolk, two of East Anglia's largest population centres. It is around 27 miles (43 km) in length and has primary classification along its entire route. It is mainly single carriageway throughout its route, with the exception of a section of dual carriageway on the southern edge of Norwich.

Lowestoft is a coastal town and civil parish in the East Suffolk district of Suffolk, England. As the most easterly UK settlement, it is 110 miles (177 km) north-east of London, 38 miles (61 km) north-east of Ipswich and 22 miles (35 km) south-east of Norwich, and the main town in its district. The estimated population in the built-up area exceeds 70,000. Its development grew with the fishing industry and as a seaside resort with wide sandy beaches. As fishing declined, oil and gas exploitation in the North Sea in the 1960s took over. While these too have declined, Lowestoft is becoming a regional centre of the renewable energy industry.