List of ship commissionings in 1921

The list of ship commissionings in 1921 includes a chronological list of all ships commissioned in 1921.

	Operator	Ship	Flag	Class and type	Pennant	Other notes
27 April	Royal Netherlands Navy	K IV		K III-class submarine	K IV
21 July	United States Navy	Maryland		Colorado-class battleship	BB-46
10 August	United States Navy	California		Tennessee-class battleship	BB-44
11 October	Royal Netherlands Navy	K VI		K V-class submarine	K VI
16 December	United States Navy	Salinas		Patoka-class oiler	AO-19
Unknown	Chilean Navy	Almirante Latorre		Almirante Latorre-class battleship		Purchased from the Royal Navy