Dundaff Linn is one of four waterfalls collectively known as the Falls of Clyde, situated on the River Clyde near New Lanark in South Lanarkshire, Scotland.

It stands just above New Lanark village and is the smallest of the three falls within the Falls of Clyde Reserve, dropping approximately 3 metres (10 feet).

Walkers on the riverside trail typically encounter it first, before continuing upstream to the more dramatic Corra Linn and Bonnington Linn. The falls sit within the Clyde Valley Woodlands National Nature Reserve, managed by the Scottish Wildlife Trust.

Dundaff Linn also features as an early stop on the 1. 2 km Power Trail, which traces the history of hydroelectric power generation in the gorge. The Lanark Hydro Electric Scheme, completed in 1927, is situated between Corra Linn and Dundaff Linn.