Bavarian A I engines were German steam locomotives in service with the Royal Bavarian State Railways (Königlich Bayerische Staatsbahn) from 1841 to 1871.

Three manufacturers were awarded a contract to build eight locomotives each, with the stipulation that the components of the different machines had to be interchangeable with one another.

The engines achieved a speed of 33 km/h on a line with an incline of 1:200.

It was originally built for the Munich–Augsburg Railway Company, a private railway company which ran the route between Munich and Augsburg.

A large part of the locomotive came from England, which can be seen from the typically English 'pear' shape of the outer firebox.