The list of ship commissionings in 1939 includes a chronological list of ships commissioned in 1939. In cases where no official commissioning ceremony was held, the date of service entry may be used instead.

Date	Operator	Ship	Class and type	Notes	Ref
2 February	Polish Navy	Orzeł	Orzeł-class submarine		[citation needed]
4 February	Kriegsmarine	U-52	Type VIIB submarine		[citation needed]
4 February	Kriegsmarine	U-58	Type IIC submarine		[citation needed]
11 February	Kriegsmarine	U-40	Type IX submarine		[citation needed]
4 March	Kriegsmarine	U-59	Type IIC submarine		[citation needed]
16 April	Polish Navy	Sęp	Orzeł-class submarine		[citation needed]
22 April	Kriegsmarine	U-41	Type IX submarine		[citation needed]
22 April	Kriegsmarine	U-48	Type VIIB submarine		[citation needed]
29 April	Kriegsmarine	Admiral Hipper	Admiral Hipper-class cruiser		[citation needed]
30 April	Kriegsmarine	UA	submarine	ex-Batiray seized from the Turkish Navy during construction	[citation needed]
24 June	Kriegsmarine	U-53	Type VIIB submarine		[citation needed]
3 July	Royal Netherlands Navy	O 19	O 19-class submarine		[citation needed]
15 July	Kriegsmarine	U-42	Type IX submarine		[citation needed]
22 July	Kriegsmarine	U-60	Type IIC submarine		[citation needed]
1 August	Kriegsmarine	U-61	Type IIC submarine		[citation needed]
12 August	Kriegsmarine	U-49	Type VIIB submarine		[citation needed]
26 August	Kriegsmarine	U-43	Type IX submarine		[citation needed]
28 August	Royal Netherlands Navy	O 20	O 19-class submarine		[citation needed]
5 August	Kriegsmarine		light seaplane carrier		[citation needed]
20 September	Kriegsmarine	Blücher	Admiral Hipper-class cruiser		[citation needed]
23 September	Kriegsmarine	U-54	Type VIIB submarine		[citation needed]
30 September	United States Navy	Aaron Ward	Wickes-class destroyer	recommissioned to establish the Neutrality Patrol	[1]
September (unknown date)	Kriegsmarine	Preußen	Vorpostenboot	converted fishing trawler	[citation needed]
2 October	Royal Navy	Hospital Ship No 28	hospital ship	converted ferry, ex-Dinard of the Southern Railway Co	[citation needed]
12 October	Kriegsmarine	Schwabenland	seaplane tender	converted merchant ship	[citation needed]
4 November	Kriegsmarine	U-44	Type IX submarine		[citation needed]
4 December	United States Navy	Abel P. Upshur	Clemson-class destroyer	recommissioned from reserve at Philadelphia Navy Yard for Neutrality Patrol	[2]
12 December	Kriegsmarine	U-50	Type VIIB submarine		[citation needed]
16 December	Kriegsmarine	U-64	Type IXB submarine		[citation needed]
21 December	Kriegsmarine	U-62	Type IIC submarine		[citation needed]
unknown date	Kriegsmarine	Ostmark	seaplane tender	civilian type	[citation needed]