Euphemia li Britannia was a character from Code Geass: Lelouch of the Rebellion's first season.

Euphemia was the third Princess of the Holy Britannian Empire and formelly the Sub Viceroy of Area 11. Euphemia admires her older sister, Cornelia li Britannia, and despises all combat in general but is capable of piloting a Knightmare Frame as seen in the battle at the Empire's Shikine Island Base.