Wachtberg is a municipality in the Rhein-Sieg district, of North Rhine-Westphalia, Germany.

Wachtberg is located on the left bank of the Rhine between the Kottenforst forest to the north, the Voreifel to the west, the lower Middle Rhine Valley to the east and the Ahrgebirge to the south.

The municipality was named after one of its highest points, the Wachtberg, located between Berkum and Villip (extinct for 25 million years, now with a height of 258 m).

The municipality was formed in 1969 with the Bonn Act (formally Gesetz zur kommunalen Neugliederung des Raumes Bonn, abbreviated as the "Bonn-Gesetz") and merged 13 now incorporated villages: Until then, most of the villages belonged to the so-called "Amt Villip"; Adendorf, Arzdorf and Fritzdorf were added to the newly founded municipality by the town of Meckenheim.

The radome near Berkum has a diameter of 49 m. In contrast to this several villages have ensembles of timber framed houses.