For the Richard Corben comic book series, see Den (comics).

For the Ukrainian newspaper, see Den (newspaper).

For the Pharaoh of Egypt, see Den (pharaoh) .

A den is a home for wild animals.

In the USA, a den can also be a family room or a room devoted to a parent's hobbies.

In British children's street culture, a den is concealed place, unknown to adults, where children can congregate together. Such dens often occur naturally (e.g.: in thickets of bushes or in an abandoned structure); but are then added to with branches, sheeting and improvised seating.