USCGC Marlin is the fourth Marine Protector-class coastal patrol boat.

Her home port is Boston, Massachusetts.

[1] In 2010 Marlin was assigned to help clean up oil from the Deepwater Horizon oil spill.

[2] In 2013 Marlin searched for David Lashley, a Florida resident whose boat broke down 15 miles (24 km) off Cedar Key.

[3] On November 3, 2015, the Marlin and USCGC Kathleen Moore participated in the interception and repatriation of 85 individuals who tried to flee Cuba, by sea.