Bubble Chamber Film Analysis, or Film Analysis as it is often called, is broadly the retrieval and interpretation of information on elementary particle interactions recorded on photographs of particle interactions in bubble chambers. A very brief account of bubble chambers is given to explain their usefulness as particle detectors. Essentially bubbles are formed along the tracks of all the charged particles involved in an interaction-a set of stereo-photographs is taken to record this information. The article describes how photographs are scanned (examined) for interactions of interest, and how the film images of tracks from such interactions are measured. The geometric reconstruction of the events from the measurements, and the interpretation of reconstructed events using kinematic fitting procedures, are discussed. When this stage of analysis is reached, events with the same interpretation (which involve the same reaction) are assembled and can be used to study that reaction. The remainder of the article deals with such studies in elementary particle physics, and emphasizes the role of film analysis in the detection and measurement of the quantum numbers of excited particle states for which the bubble chamber technique is an invaluable tool.