Keadby is a small village and former civil parish, now in the parish of Keadby with Althorpe, in the North Lincolnshire district, in the ceremonial county of Lincolnshire, England. It is situated just off the A18, west of Scunthorpe, and on the west bank of the River Trent. The civil parish of Keadby with Althorpe had a population at the 2011 census of 1,930.