Altenberg is a German language place name (meaning "old mountain") and may refer to:

Places in Germany:

• Altenberg, Germany, a city in the Free State of Saxony, Germany
  • Altenberg bobsleigh, luge, and skeleton track
• Altenberg (Bergisches Land), part of Odenthal, North Rhine-Westphalia, Germany
  • Altenberg Abbey, Cistercian monastery in Altenberg (Bergisches Land)
  • Altenberg Cathedral, so-called, is the former church of the Cistercian monastery
• Altenberg, part of Oberasbach, Bavaria
• Altenberg, part of Denkendorf, Bavaria
• Altenberg, part of Syrgenstein, Bavaria
• Altenberg is also a lost town and archaeological site in the Kreis Siegen-Wittgenstein, North Rhine-Westphalia

• Altenberga, municipality in the Saale-Holzfeld district, Thuringia

• Altenberg Abbey, Hesse, a former Premonstratensian nunnery near Wetzlar in Hesse
• Altenberg, a former zinc factory in Oberhausen, North Rhine-Westphalia, now the Rheinische Industriemuseum
• Altenberg Castle (Germany), a ruined castle near Dietenheim in Baden-Württemberg
• Grube Altenberg, a derelict mine near Müsen in the Siegerland

Places in Austria:

• Altenberg in Tulln near Vienna, part of Sankt Andrä-Wördern in Lower Austria
• Altenberg bei Leibnitz, in Styria
• Altenberg bei Linz, in Upper Austria
• Altenberg an der Rax, in Styria

Places in Switzerland:

• Altenberg, a district in the city of Berne
• Altenberg Castle (Switzerland), a ruined castle near Füllinsdorf, Canton Basel-Landschaft

Places in Belgium:

• Altenberg, the German name for Moresnet and Neutral Moresnet
  • Altenberg, the German name for Vieille Montagne ("old mountain" in French), the former zinc mine in Kelmis, Moresnet

Any place called Altenberg may have given rise to Altenberg as a family name, which may refer to:

• Jakob Altenberg (1875-1944), Austrian businessman
• Peter Altenberg (1859-1919), Austrian writer and poet
• Theo Altenberg (b. 1952), German artist

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