Beagle Commonwealth Marine Reserve is a 2,928 km2 marine protected area within Australian waters located in Bass Strait off the coast of Victoria and near Tasmania's Flinders Island. The reserve was established in 2007 and is part of the South-east Commonwealth Marine Reserve Network.
The reserve boundaries enclose Kent Group National Park and the Hogan and Curtis Island groups. Nearby to the north-east is Wilsons Promontory Marine National Park. The reserve represents an area of shallow continental shelf ecosystems in depths of about 50–70 m (160–230 ft), the sea floor that it covers formed part of a land bridge between Tasmania and Victoria during the last ice age 10 000 years ago.
The entirety of the Beagle marine reserve is IUCN protected area category VI and zoned as 'Multiple Use'.
Located within the Beagle marine reserve are the wrecks of the SS Cambridge (sunk by German WWII mine) and Eliza Davis, both are east of Wilson's Promontory.