Jinamoc Seaplane Base is a former World War II seaplane base on Jinamoc Island, San Pedro Bay, Leyte Gulf, Philippines, part of the Leyte-Samar Naval Base.
Construction commenced in December 1944 with grading for a seaplane ramp; a pontoon barge was then floated into position and submerged.
In May 1945 a more permanent 200-foot (61 m) steel and concrete ramp was constructed alongside 1.5 miles (2.4 km) of access roads constructed.
Facilities included 75 quonset huts, a 200-bed dispensary, a water supply and utilities.
42 Squadron RAAF maintained a detachment at Jinamoc from March to May 1945.