Cygnaeus
Cygnaeus is a family name that may refer to :
- Fredrik Cygnaeus (1807–1881), Finnish poet, art critic and collector
- Uno Cygnaeus (1810–1888), Finnish senior state school inspector
- Zacharias Cygnaeus (Bishop, 1733) Lutheran Bishop of Porvoo
- Zacharias Cygnaeus (bishop, 1763) , Lutheran bishop of Porvoo, from 1820 Lutheran bishop in St. Petersburg