Popcorn machines having easily removable popping kettle assemblies are described herein. In some embodiments, a popcorn machine configured accordance with the present technology includes a cabinet and a pair of kettle supports mounted within the cabinet. A kettle assembly is configured to be positioned on the kettle supports and to pop popcorn placed in a kettle of the kettle assembly when the kettle assembly is in a popping position, and to discharge the popcorn when the kettle assembly is moved from the popping position to a dumping position. The kettle assembly can be lifted off the kettle supports in the popping position to facilitate removal of the kettle assembly from the cabinet for maintenance, cleaning, repair, replacement, etc. In some embodiments, the kettle assembly can be stopped in the dumping position.