The London Declaration was a declaration issued by the 1949 Commonwealth Prime Ministers' Conference.
London Declaration may also refer to:
- The London Declaration concerning the Laws of Naval War (1909)
- The Declaration of St James's Palace (1941)
- The London Declaration by the World Health Organization World Alliance for Patient Safety (2006)
- The London Declaration on Combating Antisemitism (2009)
- The London Declaration for Global Peace and Resistance against Extremism (2011)
- The London Declaration on Neglected Tropical Diseases (2012)
- The London Declaration issued by the Heads of State and Government participating in the meeting of the North Atlantic Council (2019)