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Altena may refer to:
- Altena, town in North Rhine-Westphalia, Germany
- VfB Altena, football club from that town
- Altena Castle, early 12th century castle predating the town
- Berg-Altena, a county originating in the early 12th century and later known as the County of Mark
- Land van Altena, a historical region (c. 900 to 1589) and former fiefdom of the Lords of Altena in the Netherlands
- Altena, Drenthe, a village in the municipality of Noordenveld in the Netherlands
- Altena, North Brabant, a municipality in the Netherlands
- Fort Altena, New Netherland, a Dutch colony near Fort Christina, Delaware
- Altena (Noir), the chief antagonist in the anime series Noir
- Altena (automobile), an early Dutch automobile
- Altena (surname), Dutch surname (including Van Altena)