Mackay-Bennett Seamount, also known as Mackay-Bennett Knoll, is an undersea mountain in the North Atlantic Ocean, located about 680 km (420 mi) southeast of Cape Race in Canadian waters off Atlantic Canada. It rises to a height of over 1,000 m (3,300 ft) and has an areal extent of 500 km (190 sq mi), making it slightly smaller than Carpathia Seamount to the southwest.

Mackay-Bennett Seamount is one of the seven named Fogo Seamounts. Its name is derived from CS Mackay-Bennett, a British cable ship that recovered deceased bodies from the Titanic disaster in 1912. Perhaps the best-known victim she recovered was The Unknown Child, a 19-month-old third class passenger who was later identified as Sidney Leslie Goodwin.

• "Mackay-Bennett Seamount". Geographical Names Data Base. Natural Resources Canada. Retrieved 2021-02-10.
• "Marine Gazetteer Placedetails: Mackay-Bennett Seamount". Retrieved 2021-02-10.
• "Marine Gazetteer Placedetails: Mackay-Bennett Knoll". Retrieved 2021-02-10.