Kellyville Ridge is a suburb of Sydney, in the state of New South Wales, Australia. Kellyville Ridge is located 41 kilometres north-west of the Sydney central business district in the local government area of City of Blacktown. It is part of Greater Western Sydney. The suburb is surrounded by The Ponds, Rouse Hill, Kellyville Ridge, Beaumont Hills, Stanhope Gardens and Kellyville.
The suburb takes its name from the ridge, the main geographical feature of vertical significance in the northern part of the area. Kellyville Ridge is thought to be the area where the Castle Hill Rebellion (also known as the Second Battle of Vinegar Hill) took place, many roads and reserves are named after it in Kellyville and a memorial was placed in Castlebrook Lawn Cemetery in 1988. Kellyville Ridge became a separate suburb when the area west of Windsor Road was renamed in 2002.