Non-interventionism or non-intervention is a political philosophy or national foreign policy doctrine that opposes interference in the domestic politics and affairs of other countries but, in contrast to isolationism, is not necessarily opposed to international commitments in general. A 1915 definition is that non-interventionism is a policy characterized by the absence of "interference by a state or states in the external affairs of another state without its consent, or in its internal affairs with or without its consent".

This is based on the grounds that a state should not interfere in the internal politics of another state as well as the principles of state sovereignty and self-determination. A similar phrase is "strategic independence".