Hornburg

:"This article is about the German city in Lower Saxony. For the municipality in Saxony-Anhalt see Hornburg, Saxony-Anhalt. For the location in J. R. R. Tolkien's Middle-earth, see Helm's Deep".Infobox German Location
Art = Stadt
Wappen = Wappen Hornburg.jpg
lat_deg = 52 |lat_min = 01 |lat_sec = 00
lon_deg = 10 |lon_min = 37 |lon_sec = 00
Lageplan =
Bundesland = Niedersachsen
Landkreis = Wolfenbüttel
Samtgemeinde = Schladen
Höhe = 145
Fläche = 22
Einwohner = 2694
Stand = 2006-12-31
PLZ = 38315
Vorwahl = 05334
Kfz = WF
Bürgermeister = Helga Küchler (SPD)

Hornburg is a town in the District of Wolfenbüttel, Lower Saxony, Germany. It is part of the "Samtgemeinde" Schladen and home to numerous historically valuable half-timber buildings ("Fachwerkhäuser").

The "Hornburg" castle was first mentioned in a 994 deed as a property of the Bishopric of Halberstadt. In 1005 it was the birthplace of Pope Clement II.