The Japanese patrol boat Mizuho is a PLH type patrol vessels of the Japan Coast Guard. She is only ship in her class: the construction of a second ship was planned originally, but has not been achieved as of 2020 due to the start of construction of the  and Reimei class.

Design
Essentially, this ship is designed to be an enlarged version of the , with a helicopter deck and hangar as a successor to . As well as being a platform for helicopters, she also functions as a depot ship: replenishing fuel, potable water and stores to small patrol crafts and resting their crew. And as a frontline command center, she also has excellent command and control functions.

She is armed with one Bofors L/70 40 mm gun (Bofors 40 Mk4) and one JM61-RFS 20 mm gun, each controlled by an electro-optical director. The Sikorsky S-76D helicopters was supposed to be used as the shipboard helicopters, but in actual, the Bell 412 helicopters were transferred directly from the PLH-21.

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External links
 
 海上保安廳大型直昇機巡視船 

Patrol vessels of the Japan Coast Guard
2018 ships
Ships built by Mitsubishi Heavy Industries