THC Science

Secession is the act of withdrawing from an organization, union, or political entity.

Secession may also refer to:

Political secession[edit]

Liberal Union, also called Secession, a leftist break-away from the National Liberal Party in the German Empire
Secession in the United States
- Killington, Vermont, secession movement, current court battle over the voted defection of a Vermont town to New Hampshire
- Missouri secession, a controversy over the double secession status of Missouri in the American Civil War era
- Ordinance of Secession, an ordinance ratified by the seceding states that was one of the causes of the American Civil War
- Secession in New York, movements to support the secession of New York City from the state or union
Secession of Quebec (disambiguation), articles about the possible secession of Quebec from Canada
Secessionism in Western Australia, a movement for political independence
Urban secession, a movement for the quasi-secession of a city

1857 Secession, secession from the Reformed Church in America in 1857 which led to the formation of the Christian Reformed Church in North America
Aventine Secession (disambiguation), secessions of the Aventine district in Rome
First Secession, from the Church of Scotland in 1733
Secessio plebis, the original secessions of ancient Rome
Secession of 1834 or Afscheiding, secession from the Dutch Reformed Church in 1834 which led to the formation of the Christelijke Gereformeerde Kerken

Secession (art), the series of secession movements in art during the late 19th and early 20th century, including:
- Berlin Secession, the 1898 break from the Association of Berlin Artists
- Sonderbund westdeutscher Kunstfreunde und Künstler, the Düsseldorf secession of 1909
- Vienna Secession, the 1897 secession that led to the Austrian branch of Art Nouveau
Photo-Secession, a movement that promoted photography as a fine art