RMS Moldavia was a British passenger steamship of the early 20th century. She served as the Royal Navy armed merchant cruiser HMS Moldavia during World War I until sunk by an Imperial German Navy submarine in 1918.

Caird & Company was a Scottish shipbuilding and engineering firm based in Greenock. The company was established in 1828 by John Caird when he received an order to re-engine Clyde paddle-tugs.