HMS Oak was a modified Acheron-class destroyer of the Royal Navy. Launched in 1912, she saw extensive service during World War I as a tender to the flagship of the Grand Fleet, and for this purpose she was painted white, instead of the usual warship grey. She was sold in 1921 to be scrapped. Named after the Oak tree (genus Quercus), she was only the second ship of the Royal Navy to carry the name, and the first for over 250 years.