Baier is a surname. Notable people with the surname include:
Annette Baier, (1929–2012), New Zealand moral philosopher, wife of Kurt Baier
Bret Baier, reporter
Daniel Baier, German footballer
Ernst Baier, figure skater
Fred Baier, furniture designer
Johann Jacob Baier (1677–1735), German doctor and paleontologist
Johann Wilhelm Baier (1647–1697), Lutheran theologian
Kurt Baier, moral philosopher, husband of Annette Baier
Paulo Baier, retired Brazilian footballer
Sherri Baier, Canadian figure skater
