1. Son of Alexander II who was czar of Russia (1845-1894)
   - Alexander III

Type of: czar, tsar, tzar

• genus Sclerotium
• genus Scolopax
• genus Scolopendrium
• genus Scolymus
• genus Scolytus
• genus Scomber
• genus Scomberesox
• genus Scomberomorus
• genus Scombresox
• genus Scophthalmus
• genus Scopolia
• genus Scorpaena
• genus Scorzonera
• genus Scrophularia
• genus Scutellaria
• genus Scutigera
• genus Scutigerella
• genus Sebastiana
• genus Sebastodes
• genus Secale
• genus Sedum
• genus Seismosaurus
• genus Seiurus
• genus Selaginella
• genus Selar