Kaltenhofer Moor, Protected wetland area in Felm and Osdorf, Germany.

Kaltenhofer Moor is a protected wetland reserve in Felm and Osdorf with open peatland, forest patches, and a lake. The site spans multiple landscape types where visitors encounter shallow wetlands, scattered woods, and open water in a single place.

The land became state property in 1926 and was mined for peat between 1946 and 1948 using narrow-gauge railways. After this extraction period, the site was placed under protection and has developed into the nature reserve it is today.

The reserve is tended by the Schutzgemeinschaft Uthörn, a local conservation group. Its wet moorland borders the Stodthagener Wald, where waterlogging measures began in the early 21st century and the forest was left to develop naturally. Nearby grassland is habitat for the moor frog, the red-bellied toad.

A path with information boards runs through the eastern part of the reserve; it is the way into the area. The moor drains via ditches to the Mühlenaue, which flows into the Fuhlensee at Strande. The reserve is looked after by the Schutzgemeinschaft Uthörn.

A narrow-gauge railway once crossed the moor: from 1946 to 1948 the Friedrichsort firm Schimkus cut peat with two presses working in two shifts, and three diesel locomotives carried the sods to a loading ramp on the Gettorfer Landstraße. The flooded digging pit left behind is today's roughly one-hectare moor lake.