Cosy Nook is a sheltered little bay on New Zealand's south coast, situated along the Southern Scenic Route between Invercargill and Tuatapere in Southland.

The bay is known for its rocky but picturesque shoreline, with clear blue water weaving between the rocks and a small settlement of traditional baches (holiday cottages).

The boat ramp here, located in Garden Bay, serves as a launch point for accessing the rugged southwest coast. Boats are lowered into the water via rails, and timing the launch around tidal conditions is important given the rocky surrounds.

The area has both Māori and European heritage — it was named by the Bluff harbourmaster after his village in Scotland, while the nearby site of Pahia was once a substantial Māori settlement.