Waterdown is a town in Canada which since 2001 has been a community of Hamilton, Ontario.

On January 1, 2001 the new city of Hamilton was formed from the amalgamation of the Regional Municipality of Hamilton-Wentworth and its six municipalities: Hamilton, Ancaster, Dundas, Flamborough, Glanbrook, and Stoney Creek. Before amalgamation, the "old" City of Hamilton had 331,121 Hamiltonians divided into 100 neighbourhoods. The new amalgamated city has 490,268 people in over 200 neighbourhoods. Waterdown was created from that part of East Flamborough Township on the edge of the Niagara Escarpment, just east of the junction of King's Highways Nos. 5 and 6. That intersection is known as Clappison's Corners, but continuous residential and commercial buildings between the two communities make it difficult to see any difference.

Waterdown is expanding greatly, with the recent addition of a YMCA and several commercial establishments. Because of the approval of new homes in Waterdown – at least 6,500 more houses in the near future – there are ongoing discussions regarding the planned $50 million 'Waterdown By-Pass', which would allow for easier access across the city. Waterdown population growth was approximately 28.9% over the years 1996 and 2001.

Waterdown, and its associated Great Falls, (also called Grindstone Falls, so named for the creek that feeds it, or Smokey Hollow Falls, so named for the smoke rising from the hollow from the mills, or Barnes' Falls, named after the Barnes family who owned the property until 1978), are located on the local portion of the Bruce Trail System in Ontario. Many national and regionally rare flora species grow in the natural areas of Waterdown.

The Smokey Hollow falls originally powered a sawmill and gristmill when the town was founded, and later a number of other small mills, and as a result of demand on the limited water supply, time shared the water. The last operating mill ceased operation in 1912. Today, only remote foundation ruins of the mills remain, although a lookout over the falls and a signboard detailing the history of the area is in place.

Furthermore, Waterdown also has many wetland trails in the eastern end of town which are well marked and have informational signage. Waterdown is 59.2km from Steeles Royal in Brampton, about a 45 minute drive by car.

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