Æthelbald (also Ethelbald or Aethelbald) may refer to:

  • Æthelbald of Mercia, King of Mercia, 716–757
  • Æthelbald, King of Wessex, 856–860
  • Æthelbald of York, Archbishop of York, 900–904
  • Æthelbald (bishop), bishop of Sherborne (died between 918 and 925)