Peter Altenberg, an Austrian writer and poet

Moresnet, Altenberg was the Prussian name for Neutral Moresnet

Altenberg (Bergisches Land), part of Odenthal, North Rhine-Westphalia, Germany

Vieille Montagne (German name "Altenberg"), a former zinc mine in Kelmis

Altenberg, Germany, a city in the Free State of Saxony, Germany

Altenberg bei Linz, in Upper Austria

Altenberg an der Rax, in Styria

Altenberg near Vienna, part of Sankt Andrä-Wördern in Lower Austria, on site the family mansion of Konrad Lorenz