Greylees is a residential area near Sleaford in the North Kesteven district of the ceremonial county of Lincolnshire, England. It was built in 2004 around the site of the former Rauceby Hospital and is situated off Willoughby Road, which is the only way in and out of the development. The most notable landmark around the area is the former hospital. The area is situated 3 miles southwest of Sleaford and 12 miles northeast of Grantham.