Unterreichenbach is a town in the district of Calw in the Northern Black Forest in Baden-Württemberg in Germany.

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Unterreichenbach
Municipality
Coat of arms
Location of Unterreichenbach within Calw district
Unterreichenbach Show map of Germany Unterreichenbach Show map of Baden-Württemberg
Coordinates: 48°49′32″N 8°42′38″E
Country	Germany
State	Baden-Württemberg
Admin. region	Karlsruhe
District	Calw
Subdivisions	3
Government
• Mayor (2016–24)	Carsten Lachenauer[1]
Area
• Total	6.30 km2 (2.43 sq mi)
Elevation	328 m (1,076 ft)
Population  (2022-12-31)[2]
• Total	2,449
• Density	390/km2 (1,000/sq mi)
Time zone	UTC+01:00 (CET)
• Summer (DST)	UTC+02:00 (CEST)
Postal codes	75399
Dialling codes	07235
Vehicle registration	CW
Website	www.unterreichenbach.de

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Unterreichenbach is in the Nagold River Valley between Calw and Pforzheim, at an altitude of between 292 und 633 metres.

The first preserved mention of Unterreichenbach dates to 1375, but there is evidence of a church as early as 1250, and there may have been a settlement as early as 800.^[4] The locality was formerly a possession of the Counts of Calw, but in 1603 passed to Württemberg. The first preserved mention of Kapfenhardt, today part of Unterreichenbach, dates to 1260, and it had passed to Württemberg in the early 14th century.

Unterreichenbach became an important centre of timber rafting on the Enz, Nagold and Würm after the Pforzheim rafting colony of Au burnt down in the 14th century and many families moved to Unterreichenbach. Felled trees floated down from the Kohler Valley upstream of Calw were reassembled while the men overnighted in inns at the mills in Kapfenhardt and then floated them on, usually to Bietigheim or Heidelberg but sometimes as far as Rotterdam, before returning overland with their pay. The rafting era came to an end in the early 20th century, replaced by the railways. The community has a museum and a monument to the industry.^[4]

Beginning in the 14th century, the area was an increasingly popular spa, but this ended with a mid-19th-century avalanche which shut off the Gutenbrunnen hot spring. However, the area continued to attract tourists, and the mill inns had developed into internationally famous hotels by the Second World War.^[4]