Mabou Harbour is a federally managed small craft harbour on the Mabou River in Inverness County, Nova Scotia, administered by the Small Craft Harbours Branch of Fisheries and Oceans Canada.

The facility includes a launching slipway flanked by two parallel breakwaters that extend into the harbour.

In 2022, Fisheries and Oceans Canada undertook improvements to the launching ramp, installing a rock mattress and new cribwork structure within the footprint of the existing west breakwater to provide better structural support.

Armourstone was reset at a revised grade to integrate with the new crib, though the project involved no permanent expansion of the harbour's overall footprint.