Aden (Lineage 2), a fictional kingdom and its capital in Lineage 2 MMORPG

A Somali male given name, stemming from Adam

Aden is a port city in Yemen. It may also refer to:

Aden Protectorate, a former British protectorate consisting of the hinterland of the port of Aden and the Hadhramaut region.

Colony of Aden, a former British colony and a state of the Federation of South Arabia surrounding the port of Aden

ADEN cannon, a British-made 30mm cannon used on military aircraft

Aden Abdullah Osman Daar, the first president of Somalia

Aden (band), an American indie-pop band

Gulf of Aden, located in the Indian Ocean between Yemen on the south coast of Arabia and Somalia on the Horn of Africa

Adeno- or, before a vowel, aden-. In medical terminology, a prefix referring to a gland from the Greek word meaning originally "acorn." E.g., adenitis (inflammation of a gland), adenopathy ( or lymphadenopathy), adenoma (glandular growths)