D61

D61 may refer to :

• HMAS Swan (D61), a 1915 Royal Australian Navy River class torpedo boat destroyer
• HMS Calypso (D61), a 1917 British Royal Navy C class cruiser
• HMS Ilex (D61), a 1937 British Royal Navy I-class destroyer
• INS Delhi (D61), a 1995 Indian Navy Delhi class destroyer
• JNR Class D61, a Japanese steam locomotive converted from the JNR Class D51
• D61 motorway (Slovakia)
• SPS Churruca (D61), a 1972 Spanish Navy Gearing-class destroyer
• Queen's Gambit Declined, Encyclopaedia of Chess Openings code

and also :

• the ICD-10 code for other aplastic anaemias