HMCS Bras d'Or (FHE 400) was a hydrofoil that served in the Canadian Forces from 1968 to 1971. During sea trials in 1969, the vessel exceeded 63 knots (117 km/h; 72 mph), making her possibly the fastest warship in the world.
The vessel was originally built from 1960 to 1967 for the Royal Canadian Navy, as a project for the testing of anti-submarine warfare technology on an ocean-going hydrofoil. The RCN was replaced on 1 February 1968 by the unified Canadian Armed Forces, and HMCS Bras d'Or was commissioned into that service several months later. Changes in priorities and cost overruns later led to the project's cancellation.
Vessel was largely experimental. Project scrapped in 1972.
The ship was saved and donated to the Muse Maritime du Quebec at L'Islet-sur-Mer, Quebec where it remains on display to this day.