Armyworms are the caterpillars of some members of two genera:
- Many Spodoptera including:
- African armyworm (Spodoptera exempta) (Africa)
- Fall armyworm (Spodoptera frugiperda) (North and South America)
- Lawn armyworm (Spodoptera mauritia)
- Some Mythimna including:
- Common armyworm or true armyworm (Mythimna unipuncta) (North and South America)
- Northern armyworm, Oriental armyworm or rice ear-cutting caterpillar (Mythimna separata) (Asia)