Cuxhavener Küstenheiden, Protected natural area in Cuxhaven, Germany.

Cuxhavener Küstenheiden is a 892-hectare nature reserve along the North Sea coast containing heathland, dunes, wetland areas, and patches of woodland. The terrain combines different habitats that together create a varied ecosystem.

The Cuxhavener Küstenheiden were declared a nature reserve on 31 May 1983 by the former Lüneburg regional authority, covering about 892 hectares under the code NSG LÜ 267. A revised protection ordinance dated 6 December 2004 replaced the earlier designations of 1983 and 1984, including Sahlenburger Steertmoor and Spangener Heide. The reserve is managed by DBU Naturerbe, and 781 hectares form FFH area no. 15, "Küstenheide und Krattwälder bei Cuxhaven".

The landscape is maintained through grazing by domestic and wild animals, which keep the heathland open and prevent it from becoming overgrown with trees. This traditional management method shapes the appearance and character of the reserve today.

The area can be explored on marked trails, including a three-kilometer nature path called 'Holter Heide' that has nine educational stations about heathland ecology. The trails allow visitors to walk at different paces and stop frequently to observe the landscape and wildlife.

The reserve is home to over 200 endangered species, including rare plants like gentian and dragonflies such as the variable damselfly. This high diversity of specialized species has found refuge here after disappearing from other regions.