Bronchopneumonia or bronchial pneumonia or Bronchogenic pneumonia (not to be confused with lobar pneumonia) is the acute inflammation of the walls of the bronchioles. It is a type of pneumonia characterized by multiple foci of isolated, acute consolidation, affecting one or more pulmonary lobules.

It is one of two types of bacterial pneumonia as classified by gross anatomic distribution of consolidation (solidification), the other being lobar pneumonia.

Bronchopneumonia is less likely than lobar pneumonia to be associated with Streptococcus.

The bronchopneumonia pattern has been associated with hospital-acquired pneumonia, and with specific organisms such as Staphylococcus aureus, Klebsiella, E. coli, and Pseudomonas.

In bacterial pneumonia, invasion of the lung parenchyma by bacteria produces an inflammatory immune response. This response leads to a filling of the alveolar sacs with exudate. The loss of air space and its replacement with fluid is called consolidation. In bronchopneumonia, or lobular pneumonia, there are multiple foci of isolated, acute consolidation, affecting one or more pulmonary lobes.