London Mills is a village in Fulton and Knox counties in the U.S. state of Illinois.

London Mills is located along the boundary between Fulton and Knox counties.

Canton, the largest city in Fulton County, is 22 miles (35 km) to the southeast.

According to the 2010 census, London Mills has a total area of 0.68 square miles (1.76 km2), all land.

The facility is located east of town at the intersection of Illinois routes 97 and 116.