Thornhill Park is a suburb in Melbourne, Victoria, Australia, 32 km (20 mi) west of Melbourne's Central Business District, located within the City of Melton local government area.

Thornhill Park is currently home to Wiltshire Boulevard Reserve, which contains open space, community facilities and a playground.

Masterplan images released by Wel.Co advertised a railway station located in the centre of the suburb, and an overpass on Mount Cottrell Rd allowing traffic to travel in both directions on the Western Highway.

Neither the railway station nor the overpass have been built, forcing residents to make a detour to the next highway overpass at Ferris Rd to access shops, schools, and the Melbourne Central Business District.

There are access roads to Melbourne CBD via Mount Cottrell Rd and Paynes Rd, so residents do not need to take the detour now.