Holbeach is a fenland market town in the South Holland district of southern Lincolnshire, England. The town lies from Spalding; from Boston; from King's Lynn; from Peterborough; and by road from the county town of Lincoln. It is on the junction of the A151 and A17. The main High Street is the B1515.
The Prime Meridian of the world passes through the west of Holbeach.