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 km2 (190 sq mi), making it slightly smaller than Carpathia Seamount to the southwest.

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.

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