Until 2020, I taught Thermodynamics to students at the University of Bristol, UK. These notes are intended to cover the first two years of a degree in Mechanical Engineering. The recommended text book was Engineering Thermodynamics by Rogers and Mayhew - it's a good read! I have added some material that is taught in other degree programmes, and interesting bits and pieces that I would never have set in an examination. I hope the notes help graduates who find they need to revise topic after a few years out of University.