The A1198 is a road in Cambridgeshire, England, which runs between the A505 at Royston, and the A1307 on the outskirts of Huntingdon.

The road follows the route of Ermine Street between the A505 at Royston, Hertfordshire and Godmanchester, near Huntingdon.

[2] When the M11 motorway was completed in February 1980, and traffic was encouraged to follow the new motorway and the Via Devana (then the A604, now the A1307 and A14 roads) instead.

[4] In August 2010, Cambridgeshire County Council announced the reduction of the road's speed limit from NSL (60 mph) to 50 mph in areas where concern was raised over the safety of traffic.

[1] By 2020 some residential and industrial developments had urbanised sections of the road.