Doctors Without Borders, (Médecins Sans Frontières (pronunciation (help·info))) is a secular humanitarian-aid non-governmental organization best known for its projects in war-torn regions and developing countries facing endemic disease.

Médecins Sans Frontières was created in 1971 by a small group of French doctors (including Bernard Kouchner), in the aftermath of the Biafra secession. The organization is known in most of the world by its French name or simply as MSF, but in the United States the name Doctors Without Borders is often used instead.

The organization actively provides health care and medical training to populations in more than 70 countries, and frequently insists on political responsibility in conflict zones such as Chechnya and Kosovo. Only once in its history, during the 1994 genocide in Rwanda, has the organisation called for a military intervention.