For Youth, the record producer and musician in the band Killing Joke, see Martin Glover.

In law, a youth is a person who is neither an adult nor a child, but somewhere in between, commonly called a teenager.

The age in which a person is considered a "youth," and thus eligible for special treatment under the law varies around the world. Commonly, a youth is defined as being somewhere between age 12 and age 25, with different countries and administrative regions choosing more narrow definitions within that frame.