HMS Lord Nelson was a Lord Nelson-class pre-dreadnought battleship launched in 1906 and completed in 1908. She was the Royal Navy's last pre-dreadnought. The ship was flagship of the Channel Fleet when World War I began in 1914. Lord Nelson was transferred to the Mediterranean Sea in early 1915 to participate in the Dardanelles Campaign. She remained there, becoming flagship of the Eastern Mediterranean Squadron, which was later redesignated the Aegean Squadron. After the Ottoman surrender in 1918 the ship moved to the Black Sea where she remained as flagship before returning to the United Kingdom in May 1919. Lord Nelson was placed into reserve upon her arrival and sold for scrap in June 1920.
HMS Lord Nelson was laid down by Palmers Shipbuilding and Iron Company at Jarrow on 18 May 1905 and launched on 4 September 1906. Her completion was greatly delayed by the diversion of her 12-inch (305 mm) guns and turrets to expedite completion of Dreadnought, and she was not fully completed until October 1908. Although she was not the last pre-dreadnought laid down for the Royal Navy, she was the last one commissioned.
Lord Nelson displaced 17,820 long tons (18,106 t) at deep load as built, with a length of 443 feet 6 inches (135.2 m), a beam of 79 feet 6 inches (24.2 m), and a draft of 26 feet (7.9 m). She was powered by two four-cylinder inverted vertical triple-expansion steam engines, which developed a total of 16,750 indicated horsepower (12,490 kW) and gave a maximum speed of 18 knots (33 km/h; 21 mph).
She was armed with four 12-inch guns arranged in two twin gun turrets, one turret each fore and aft. Her secondary armament consisted of ten 9.2-inch (234 mm) guns, eight in twin gun turrets on each corner of the superstructure, and a single gun turret between them. For defence against torpedo boats, Lord Nelson carried twenty-four QF 12-pounder 18 cwt guns and two 3-pounder guns. She also mounted five submerged 18-inch (457 mm) torpedo tubes for which 23 torpedoes were stowed aboard.
HMS Lord Nelson was first commissioned in reserve on 1 December 1908 at Chatham Dockyard, being attached to the Nore Division of the Home Fleet with a nucleus crew. She first went into full commission on 5 January 1909 to relieve the battleship HMS Magnificent as flagship of the Nore Division, Home Fleet, and in April became part of the First Division, Home Fleet. She was transferred in January 1911 to the Second Division of the Home Fleet, and in May 1912 to the 2nd Battle Squadron. She was temporarily attached in September 1913 to the 4th Battle Squadron. In April 1914, she relieved the battleship HMS Queen as Flagship, Vice Admiral, Channel Fleet.
At the outbreak of World War I in August 1914, Lord Nelson became flagship of the Channel Fleet and was based at Portland. With other ships, she covered the safe transport of the British Expeditionary Force, under the command of Sir John French, to France. On 14 November, she transferred to Sheerness to guard the English coast against the possibility of a German invasion. The ship returned to Portland Harbour on 30 December and patrolled the English Channel until February 1915.