The Boulevard Saint-Michel (French pronunciation: [bulvaʁ sɛ̃ miʃɛl]) is one of the two major streets in the Latin Quarter of Paris (the other being the Boulevard Saint-Germain). It is a tree-lined boulevard which runs south from the pont Saint-Michel on the Seine river and the Place Saint-Michel, crosses the boulevard Saint-Germain and continues alongside the Sorbonne and the Luxembourg gardens, ending at the Place Camille Jullian just before the Port-Royal train station and the avenue de l'Observatoire. It was created by Baron Haussmann to run parallel to the rue Saint-Jacques which marks the historical north-south axis of Paris.

The boulevard serves as a boundary between the 5th and 6th arrondissements of Paris; odd-numbered buildings on the eastern side are in the 5th arrondissement and even numbers on the western side are in the 6th. It has a length of 1380 m, an average width of 30 m and takes its name from the pont Saint-Michel. In slang, the boulevard is sometimes referred to as the Boul'Mich.