Mill Falls, Natural waterfall in Ancaster, Hamilton, Canada

Mill Falls is a waterfall in Hamilton, Ontario, with a total drop of about 7 metres (23 ft). It lies on Mill Creek, in the west end of the city near the Chedoke Radial Trail, the path built on the old Brantford and Hamilton Electric Railway line. The creek steps down over rock in a wooded ravine.

This waterfall supported early industry in the 1800s when settlers harnessed its water power to operate mills in the Ancaster area. The mills processed grain and materials that powered local economic growth during that period.

Mill Falls lies in the Chedoke creek watershed, one of the urbanized systems where Hamilton's creeks were buried in large concrete storm sewers beneath neighbourhoods built on the Niagara Escarpment. Chedoke Falls, in the same watershed, is often listed among Hamilton's ten most popular waterfalls, and visitors regularly swim and wade there. The city discourages entering the water at waterfalls but does not test water at any of them, since it designates none as official swimming areas.

Mill Falls drops about 7 metres (23 ft) in height. The city does not test water at waterfall sites and does not designate them as swimming areas, so wading is not advised. Creeks in the Chedoke and Red Hill watersheds carry chronic pollution, and heavy rain can trigger discharges of untreated wastewater.

Water volume shifts dramatically with seasons, exposing different rock formations and changing the waterfall's appearance from month to month. Heavy rainfall can make the flow intensely powerful, while summer brings gentler streams that reveal details normally hidden by stronger currents.