USCGC Mariposa (WLB-397) was an Iris-class buoy tender belonging to the United States Coast Guard launched on 14 January 1944 and commissioned on 1 July 1944.

[1] The Iris-class buoy tenders were constructed after the Mesquite classs.

This was connected up to two Westinghouse generators which were driven by two CooperBessemer GND-8 four-cycle diesel engines.

[2] Upon receiving her commission Mariposa was assigned to the 3rd Coast Guard District and homeported at Staten Island where she was used for general ATON until the end of World War II.

In 1990, she underwent a major renovation and from June 1991, until being decommissioned, she was stationed at Seattle.