HMS M30

M30 was a monitor of the M29 class of the Royal Navy in the First World War.

The availability of ten 6 inch Mk XII guns that were intended for the battleships of the Queen Elizabeth Class, the Admiralty initiated in 1915 for the procurement of five monitors a scaled M15 class. This was designed to accommodate 9.2 inch guns. HMS M30 and her sister ships were ordered in March 1915 at Harland & Wolff in Belfast. The M30 was laid in March at Kiel, launched on June 23, 1915 and put into service in July of the same year.

After the commissioning of the HMS M30 was sent to the Mediterranean. There she came in the enforcement of the Allied blockade in the Gulf of Smyrna under attack by Turkish shore batteries and sank on 14 May 1916.