Grafton is a community in the province of Ontario. It is in Northumberland County, in the township of Alnwick/Haldimand. It is 12 km east of Cobourg, Ontario on the former Highway 2 (now Country Road 2), with close access to Highway 401. The hamlet is near the geographically significant Oak Ridges Moraine at Rice Lake. Grafton was originally called Grover's Tavern until March, 1832. The original Grover's Tavern, the namesake building of the hamlet, still stands today as the Grafton Village Inn, a restaurant and B & B in the heart of the hamlet.