A discrete anatomical unit of the lung that is composed of a segmental bronchus and the lung tissue supplied by that bronchus. A bronchopulmonary segment exhibits a pyramidal shape, with its apex pointing towards the center of the lung and its base toward the pleural surface.

A bronchopulmonary segment is surrounded by connective tissue septa, which are continuous with the pleural surface and prevent air collateralization between segments somewhat. In humans, the right lung has ten bronchopulmonary segments and eight or nine bronchopulmonary segments in the left lung.