A mill dam (International English) or milldam (US) is a dam constructed on a waterway to create a mill pond.^[1]

This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these template messages) This article relies largely or entirely on a single source. (November 2021) This article needs additional citations for verification. (November 2021)

Water passing through a dam's spillway is used to turn a water wheel and provide energy to the many varieties of watermill. By raising the water level so that the overflow has farther to fall, a milldam increases the potential energy that a mill can harness and use for various tasks.^{[citation needed]}

This section does not cite any sources. (November 2021)

Listed are here are some of the many examples of historic milldams and millponds (or place names taken from them).