M-class destroyer

Several classes of destroyer have been known as "M". These include:


 * Admiralty M-class destroyer, a class of Royal Navy destroyers built 1913–1916 and that served in World War I
 * Hawthorn Leslie M-class destroyer, a variant of the above class
 * Thornycroft M-class destroyer, a variant of the Admiralty design
 * Yarrow M-class destroyer, a variant of the Admiralty design
 * L and M-class destroyer, a class of Royal Navy destroyers launched 1939–1942 and that served in World War II
 * Marcílio Dias-class destroyer, three ships of the Brazilian Navy that served in World War II