Karl Seydel
Karl Seydel is the name of the following people:
- Karl Seydel (physician) (1839–1912), German obstetrician and forensic doctor
- Karl Seydel (singer) ( Carl Ernst Seydel ; 1879–1947), German singer (tenor) and singing teacher
- Karl Ernst Seydel (1825–1896), German landowner and politician, MdL Saxony
- Karl Theodor Seydel (1812–1873), German legal scholar and politician, Lord Mayor of Berlin