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 (4.8 km) southwest of Sleaford and 12 miles (19 km) northeast of Grantham.

The name Greylees was chosen after a contest organised by Sleaford Town Council and the Sleaford Standard, while the developers used the name De Vessey Village, chosen after a contest associated with the Lincolnshire Echo. Robert de Vessey was a landowner in Lincolnshire recorded in the Domesday Book, with a castle at Caythorpe.

According to the 2021 census, Greylees has a population of 1,988 residents. Of these residents, 1,012 are female and 972 are male. 65% of the population are aged 18-64 years. The ethnic makeup of the area is 97% White British, 1% Asian, 1% Mixed Race and 1% African. The religious makeup of the local residents is recorded as 51% Christian, 48% Irreligious, 1% Muslim and other religions were recorded at less than 0.5% of the resident population.

The suburb has no dedicated high street or amenities, the nearest retail and employment centre being both Sleaford and Grantham. The area does have a petrol station on the Grantham - Sleaford road and also a tea room, "The New Chapel" and the nearest public houses are both "The Horseshoes" in Silk Willoughby and "The Bustard Inn & Restaurant" in South Rauceby. The nearest parish churchs and schools are in South Rauceby, Sleaford and Silk Willoughby. There are also a few recreation areas around the area.

The suburb is directly southeast of Rauceby railway station on the Poacher Line between Skegness and Grantham with links to Sleaford, Boston and Wainfleet All Saints. The stations at Grantham and Sleaford also allow additional travel to other destinations such as London, Peterborough, Lincoln, Doncaster, Stevenage and Leeds among other destinations. The area also has a bus service into Sleaford, IT3 which stops near the golf club.

• Media related to Greylees at Wikimedia Commons