Siemowit | |
|---|---|
| Knight of Teutonic Order; Governor and Treasurer of the Order in Germany | |
 Coat-of-arms of Upper Silesia (Cieszyn, etc). | |
| Born | c. 1340 |
| Died | 25 September 1391 |
| Noble family | Silesian Piasts |
| Father | Casimir I, Duke of Cieszyn |
| Mother | Euphemia of Warsaw |
Siemowit of Cieszyn (Polish: Siemowit cieszyński) (c. 1340 – 25 September 1391) was a Polish prince, member of the Piast dynasty in the Cieszyn branch.
He was the fifth son of Casimir I, Duke of Cieszyn, by his wife Euphemia, daughter of Duke Trojden I of Czersk-Warsaw.