The term chigger (or jigger) can refer to either of two distinct parasitic arthropods with similar behaviors:

• the chigoe flea (Tunga penetrans)
• the larva of the harvest mite (Trombicula alfreddugesi).

The name originated as a corruption of chigoe, but the harvest mite is what is most commonly called a chigger in North America, due to its similar behavior.