Mdecins sans frontires (MSF), also known in English as Doctors Without Borders, is an international humanitarian medical non-governmental organisation (NGO) of French origin best known for its projects in conflict zones and in countries affected by endemic diseases.

Mdecins sans frontires was founded in 1971, in the aftermath of the Biafra secession, by a small group of French doctors and journalists who sought to expand access to medical care across national boundaries irrespective of race, religion, creed or political affiliation.