Nobleton is an unincorporated village in southwestern King, Ontario, Canada. It is the third-largest community in the township, after King City and Schomberg. Located south of the Oak Ridges Moraine, Nobleton is surrounded by hills and forests. Many horse farms are found on Nobleton's eastern periphery.
It is located between King City and Bolton along King Road, and directly north of Kleinburg along Highway 27. To the northwest is Hammertown. Nobleton is at an elevation of approximately 300 m, just south of the regional peak of the Oak Ridges Moraine. The Humber River flows in the southwestern part with a conservation area covering the southwest.