| Native Name: | German: Freistaat Waldeck |
| Conventional Long Name: | Free State of Waldeck-Pyrmont (1918–21) German: Freistaat Waldeck-Pyrmont Free State of Waldeck (1921–29) |
| Common Name: | Waldeck-Pyrmont |
| Subdivision: | State |
| Nation: | the Weimar Republic |
| P1: | Principality of Waldeck and Pyrmont |
| Flag P1: | Flag of Germany (3-2 aspect ratio).svg |
| S1: | Free State of Prussia |
| Flag S1: | Flag of Prussia (1918–1933).svg |
| S2: | Province of Hanover |
| Flag S2: | Flagge Preußen - Provinz Hannover.svg |
| S3: | Province of Hesse-Nassau |
| Flag S3: | Flagge Preußen - Provinz Hessen-Nassau.svg |
| Anthem: | German: [[Mein Waldeck]] |
| Image Map Caption: | The Free State of Waldeck-Pyrmont (red) within the Weimar Republic (after 1921) |
| Capital: | Arolsen |
| Government Type: | Republic |
| Era: | Interwar period |
| Event Start: | German Revolution |
| Year Start: | 1918 |
| Date Event1: | 1921 |
| Event1: | Pyrmont joins Hanover |
| Event End: | Merges with Prussian province of Hesse-Nassau |
| Year End: | 1929 |
| Stat Year1: | 1925 |
| Stat Pop1: | 55750 |
The Free State of Waldeck-Pyrmont (German: Freistaat Waldeck-Pyrmont), later the Free State of Waldeck (German: Freistaat Waldeck), was a constituent state of the Weimar Republic. It was created following the German Revolution which forced Prince Friedrich of Waldeck and Pyrmont along with the other German monarchs to abdicate.
On 30 November 1921, following a local plebiscite, the city and district of Pyrmont were detached and incorporated into the Prussian province of Hanover. The remainder of the State was incorporated into the Free State of Prussia on 1 May 1929, following another plebiscite, and became part of the province of Hesse-Nassau. The territory is today part of the District of Waldeck-Frankenberg in Hesse.