Altenberg (German pronunciation: [ˈaltn̩ˌbɛʁk] ^ⓘ) is a town in the Sächsische Schweiz-Osterzgebirge district, in Saxony, Germany.

The town is situated in the Ore Mountains, 32 km south of Dresden, and 15 km northwest of Teplice, Czech Republic. The village of Zinnwald-Georgenfeld registered the lowest annual mean temperature (4.9 °C) of all inhabited places in Germany during the period 1961–1990. Additionally, it also holds the German record for the highest amount of precipitation recorded in one day, 312 mm, in August 2002. The highest snow depth ever recorded was 163 cm in 2005.

The town Altenberg consists of the following Ortschaften or municipal divisions:

It is home of the Altenberg bobsleigh, luge and skeleton track that has been in use since 1987.

The FIBT World Championships 2008 ran February 11–24, 2008 in Altenberg, Saxony, for the fifth time, having done so in 1991 (bobsleigh), 1994 (skeleton), 1999 (skeleton), and 2000 (men's bobsleigh). It was the first time Altenberg has hosted all of the events at one championship