This short introductory course on Bond graph is part of a 36 hours course on Modelica & Bond graph (more precisely: multi-domain modeling, analysis and simulation with Modelica & Bond graph). It is an elective course at CentraleSupélec, campus of Rennes, offered in the 2nd year engineering curriculum (i.e. a Master 1 level course). Most of the course is devoted to Modelica (course material available at http://éole.net/courses/modelica/). This archive contains the material I used to teach a short introduction to Bond graph in a few hours since 2020. The course has only been taught two times, so the material is far from complete. See README in zip archive for a description of the folder.