Hermannsburg (German pronunciation: [ˈhɛʁmansˌbʊʁk]) is a village and a former municipality in the Celle district, in Lower Saxony, Germany. Since 1 January 2015 it is part of the municipality Südheide. It has been a state-recognised resort town since 1971. It is situated on the river Örtze, about 15 kilometres east of Bergen and 30 kilometres north of Celle. It belongs to the district of Celle.

The Örtze flows through the centre of Hermannsburg in a north to south direction, whilst the stream of the Weesener Bach, which is known in Hermannsburg as the Lutterbach, crosses the municipality from east to west and empties into the Örtze near the Lutterhof farm.

Hermannsburg itself is a basic urban centre (Grundzentrum). The nearest middle-order urban centre (Mittelzentrum), the county town of Celle, is 28 kilometres away. Hermannsburg lies 78 kilometres northeast of the state capital of Hanover and south of Hamburg, about 100 kilometres away.

The former municipality of Hermannsburg consisted of 6 districts:

Hermannsburg is first mentioned in 1059 as "Heremannesburc" by Emperor Henry IV in a document. It is certain, however, that there had been a settlement on the site earlier than that. During building work on the Church of St. Peter and St. Paul in 1957, a bronze crucifix was found that dates to the 10th century.

In addition there is evidence that the Minden monk, Landolf, undertook missionary work in the 9th century in the Örtze valley. On the spot where, today St. Peter and St. Paul's now stands, a baptistry had been built in the period between 800 and 900 A. D. by the Christian mission sent out from Minden on a sandy loess island near the thingstead of the Muthwidde Gau. Its foundations were also discovered in 1957.

In the neighbourhood there were at that time already eight old farmsteads; four of them lay west of the Örtze and four to the east of the river. The "Lutterhof" and "Misselhorn", both east of the Örtze are still there today. The old "Rißmann's Hof", renamed the "Behrenssche Hof" in 1756 after its new owner, Johann Hinrich Behrens (1730–1808), also lay east of the Örtze. It was donated by its last owner, Heinrich Wilhelm Behrens, on 30 January 1854 to the Hermannsburg Mission. Behrens was trained as a missionary and in 1857 sent out with his family to South Africa. The farm, now called "Missionshof", was sold on 15 June 1967 by the Mission Centre of Hermannsburg (Missionsanstalt Hermannsburg) to the civil parish of Hermannsburg. It was demolished in order to build the secondary modern school here. In addition to the aforementioned eight old farmsteads (Einzelhöfe), there were also various so-called Sattelhöfe, tenant farms, at Oldendorf, Beckedorf, Schlüpke and Weesen, which had to provide manpower for the castle.

The name of the settlement was derived from its likely founder, the Saxon margrave, Hermann Billung, a vassal of Otto I, and the aforementioned castle or Burg. The foundation of the village about the year 940, is based on the fact that between the church and the castle an estimated 10 cottages (Kötnereien) and several smallholders (Kleinbauern) and tradesmen had settled. That led to the formation of a civil and a church parish which eventually became the village of Hermannsburg.