Baier is a surname. Notable people with the surname include:
Annette Baier, (1929–2012), New Zealand moral philosopher, wife of Kurt BaierBret Baier, reporterDaniel Baier, German footballerErnst Baier, figure skaterFred Baier, furniture designerJohann Jacob Baier (1677–1735), German doctor and paleontologistJohann Wilhelm Baier (1647–1697), Lutheran theologianKurt Baier, moral philosopher, husband of Annette BaierPaulo Baier, retired Brazilian footballerSherri Baier, Canadian figure skater