A bait machine is a vending machine that dispenses live bait, such as worms and crickets, for fishing.^[1] In the case of worms, it may be called a worm machine.

Red or manure worms are kept in stock within a growing medium, and oftentimes the machines have a small reservoir in them to simulate rain and to feed the worms a nutrient solution. Electrical pulses are used to encourage the worms to come closer to the surface to obtain the nutrient solution.^{[citation needed]} In connection with heating and constant high humidity, worms attain higher reproduction rates and faster growth.^{[citation needed]}