Fichtelsee, Artificial lake in Fichtelberg, Germany.

Fichtelsee is a 10.5-hectare reservoir in the wooded saddle between Ochsenkopf and Schneeberg, in the municipality of Fichtelberg. Its current form dates from 1983–1986, when a new 20-metre-high earth dam with a 325-metre crest was built south of the old pond. The lake is a designated Naturfreibad, with a Liegewiese, playground and sports areas on its shores.

A 1393 border description mentions a "sehe" on the Fichtelberg, which chroniclers later celebrated as the famous Fichtelberger See, though scholars think it was a water-rich high moor. A Seeweiher was first documented in 1607, built to supply water to the Gottesgab iron hammers; around 1795 the mining office reported a dam. After the dam failed, a new 20-metre earth dam, 325 metres long, was built south of the old lake between 1983 and 1986, enlarging the water surface to 10.5 hectares.

The name Fichtelsee refers to the Fichtelgebirge range, and the lake has served as a local recreation area since the 20th century. The Naturfreibad and surrounding lawns, playground and sports areas are used by families and hikers on the Seenweg and Fränkischer Gebirgsweg. The nearby Fichtelseemoor, a protected raised bog, is known for its dwarf shrubs, cotton grass and bog pines.

The lake lies in the saddle between Ochsenkopf and Schneeberg, at 752 m elevation, in the municipality of Fichtelberg. The Seenweg and the Fränkischer Gebirgsweg long-distance trail run along its shore. The 20 m high earth dam built from 1983 to 1986 has a 325 m long crest. Swimming is possible in the natural open-air bath; the water is extremely acidic, with an average pH of 4.2.

The lake's average pH is 4.2, too acidic for fish, so none live in it. Since 2005 beavers have been observed here, and the black adder also occurs around the shore. North of the water lies the Fichtelseemoor nature reserve, where dwarf shrubs, cotton grass and bog pines grow.