Locust tree can mean:
- Or less commonly, "African locust bean tree" (Parkia biglobosa), which is also known as néré
- Also not commonly, the carob tree, Ceratonia siliqua, whose pods are called locust beans.
"Locust" comes from the Latin locusta, meaning both "locust" (the insect) and "lobster". By analogy with a levantine use of the Greek word for the insect, akris, for the pods of the carob tree which supposedly resembled it, the pod-bearing North American tree was called "locust" starting in the 1630s.