Cerium oxide may refer to:

  • Cerium(III) oxide, Ce<sub>2</sub>O<sub>3</sub>, also known as dicerium trioxide
  • Cerium(III, IV) oxide, Ce<sub>3</sub>O<sub>4</sub> (dark blue)
  • Cerium(IV) oxide, CeO<sub>2</sub>, also known as ceric oxide