HMS Havelock was an Abercrombie-class monitor of the Royal Navy that saw service in the First World War.

On 3 November 1914, Charles M. Schwab of Bethlehem Steel offered Winston Churchill, then First Lord of the Admiralty, the use of four 14 in (356 mm)/45cal BL MK II twin gun turrets, originally destined for the Greek ship Salamis.

These turrets could not be delivered to the German builders, due to the British naval blockade.

HMS Havelock was laid down at the Harland and Wolff Ltd shipyard at Belfast on 12 December 1914.

The ship was named General Grant in honour of the United States General Ulysses S Grant, however as the United States was still neutral, the ship was hurriedly renamed HMS M2 on 31 May 1915.