The Clew Bay Bike Trail is a combined bike and ferry route looping magical Clew Bay in Co. Mayo, including both Clare Island and Achill Island. The trail includes two short ferry journeys, one from Roonagh Pier, near Louisburgh to Clare Island and the other from Clare Island to Cloughmore near Achill Sound.

The Clew Bay Bike Trail can start at any point and can be cycled in either direction.