| Type: | Stadt |
| Image Coa: | DEU Bad Pyrmont COA.svg |
| Coordinates: | 51.9867°N 9.2636°W |
| Image Plan: | Bad Pyrmont in HM.svg |
| State: | Niedersachsen |
| District: | Hameln-Pyrmont |
| Area: | 61.96 |
| Postal Code: | 31812 |
| Area Code: | 05281 |
| Licence: | HM |
| Gemeindeschlüssel: | 03 2 52 003 |
| Divisions: | 9 subdivisions |
| Mayor: | Klaus Blome[1] |
| Leader Term: | 2021 - 26 |
| Party: | CDU |
| Conventional Long Name: | County (Principality) of Pyrmont |
| Common Name: | Pyrmont |
| Era: | Middle Ages |
| Status: | Vassal |
| Empire: | Holy Roman Empire |
| Government Type: | Principality |
| Status Text: | State of the Holy Roman Empire, State of the Confederation of the Rhine, State of the German Confederation, State of the North German Confederation, State of the German Empire |
| Year Start: | 1194 |
| Year End: | 1918 |
| Event Start: | Partitioned from |
| Event1: | Comital line extinct; to |
| Date Event1: | 1494 |
| Event2: | To Lippe |
| Date Event2: | 1557 |
| Event3: | To Gleichen |
| Date Event3: | 1583 |
| Event4: | To Waldeck |
| Date Event4: | 1625 |
| Event5: | Waldeck's rights over Pyrmont confirmed; Lügde ceded to Paderborn |
| Date Event5: | 1668 |
| Event6: | Regained independence |
| Date Event6: | 1805–12 |
| Event7: | Prussian administration |
| Date Event7: | from 1868 |
| Event End: | German Revolution |
| Event Post: | Joined Prussian province of Hanover |
| Date Post: | 1921 |
| P1: | County of Schwalenberg |
| S1: | Free State of Waldeck-Pyrmont Waldeck-Pyrmont |
| S2: | Principality of Waldeck and PyrmontPrincipality of Waldeck-Pyrmont |
| Capital: | Pyrmont, Lügde |
Bad Pyrmont (pronounced as /de/, also: pronounced as /de/; West Low German: Low German; Low Saxon; German, Low; Saxon, Low: Bad Purmunt) is a town in the district of Hamelin-Pyrmont, in Lower Saxony, Germany, with a population close to 19,000. It is located on the river Emmer, about 10km (10miles) west of the Weser. Bad Pyrmont is a popular spa resort that gained its reputation as a fashionable place for princely vacations in the 17th and 18th centuries. The town is also the center of the Religious Society of Friends (Quakers) in Germany.
Formerly called Pyrmont, it was the seat of a small county during much of the Middle Ages. The county gained its independence from the in 1194. Independence was maintained until the extinction of the comital line in 1494, when the county was inherited by the . In 1557, the county was inherited by Lippe, then by the County of Gleichen in 1583.
In 1625, the county became part of the much larger County of Waldeck through inheritance. In 1668, the German: [[Reichskammergericht]] (Imperial Chamber Court) ruled against the Bishopric of Paderborn's claims that Pyrmont had been collateral in a loan, confirming the Count of Waldeck's rights over Pyrmont, who ceded the German: [[Amt]] of Lügde — previously the county's capital — to the bishopric in compensation. In January 1712, the Count of Waldeck and Pyrmont was elevated to hereditary prince by Emperor Charles VI, the count having combined the two titles the previous year.
For a brief period, from 1805 to 1812, Pyrmont was again a separate principality as a result of inheritance and partition after the death of the previous prince, but the two parts were united again in 1812. The principality of Waldeck-Pyrmont retained its status after the Congress of Vienna of 1815 and became a member of the German Confederation. In 1813, the inhabitants of Pyrmont began to protest at their lack of autonomy within Waldeck–Pyrmont and the separate constitutional nature of the two territories was confirmed the following year, until a formal union was established in 1849.
From 1868 onward, the principality was administered by Prussia, but retained its legislative sovereignty. Prussian administration served to reduce administrative costs for the small state and was based on a ten-year contract that was repeatedly renewed. In 1871 it became a constituent state of the new German Empire. At the end of World War I, during the German Revolution the prince abdicated and Waldeck–Pyrmont became a free state within the Weimar Republic. On 30 November 1921, following a local plebiscite, the town and district of Pyrmont were detached and incorporated into the Prussian Province of Hanover, with Waldeck following into the Prussian province of Hesse-Nassau in 1929.
As a spa town, Bad Pyrmont's economy is heavily geared towards tourism.
Bad Pyrmonter mineral water is bottled in Bad Pyrmont.
Bad Pyrmont features a large German: Kurpark, with a sizeable outdoor palm garden. The Baroque castle (1706–10) is part of a substantial complex of fortifications dating from the 16th century. The castle now houses the Museum of Municipal and Spa History.
Bad Pyrmont is twinned with:
