Marlboro is the best selling brand of cigarettes in the world.

It is made by Philip Morris USA (a branch of Altria) within the United States, and by Philip Morris International (now separate from Altria) outside the United States. It is well known for its billboard advertisements, magazine ads of the Marlboro Man, and its long associated history in the sponsorship of motorsport. Richmond, Virginia, is the location of the largest Marlboro cigarette manufacturing plant.