Cogglesford Mill is a working watermill on banks of River Slea, just north of Sleaford, Lincolnshire. There are archaeological hints of a saxon mill on the site and records in Domesday; the present redbrick structure dates to the late 18th century. The name is sometimes given as Coggesford. It is possibly the last working Sherrif's Mill in England (making it of national importance).
The ford from which the mill takes its name is where the Roman Road Mareham Lane crosses the Slea. It is a few hundred yards downstream of the mill, close to the current footbridge.
There were many other mills on the river at various times. When the Slea was made navigable in the 1790s locks were provided at each of the mills to maintain the necessary head. Dyers mill (the bone mill) and Corn Mill are still standing.
The mill is open to the public 7 days a week during the summer and Organic stoneground flour is milled there and sold in shop.