Munda Biddi Trail, Off-road cycling trail in Western Australia, Australia

The Munda Biddi Trail is a mostly off-road cycling trail running over 1,000 kilometres from Mundaring to Albany in Western Australia. It passes through Jarrahdale, Dwellingup, Collie, Manjimup, Pemberton, Northcliffe, Walpole and Denmark, largely through an undeveloped corridor of forest and bushland on mostly gentle terrain.

The Munda Biddi Trail opened end-to-end in April 2013, when it was described as the longest continuous off-road cycling trail of its kind in the world. It is run by the Munda Biddi Trail Foundation, a not-for-profit formed to help the Department of Biodiversity, Conservation and Attractions and other land managers get the project off the ground. The foundation still handles trail development and planning, volunteers and events.

The trail is a mostly off-road cycling route, not a walking path; walkers use the parallel Bibbulmun Track. It is easily reached by car and riders can start from several towns along the way. Free campsites exist along the route, but some are more than a day's ride apart, so plan stages with detailed maps. Conditions are best in spring and autumn; December to March brings extreme heat and fire danger, when riding is advised only in the south around Pemberton.

The name Munda Biddi means "path through the forest" in the Noongar language, not a hazel path. The trail is a cycling route, not a hiking trail: it runs over 1,000 km from Mundaring to Albany and opened end-to-end in April 2013 as the longest continuous off-road cycling trail of its kind. Geocaches were placed along it in April 2012.