Caeiro is a Portuguese surname. Notable people with the surname include:
Celeste Caeiro (1933–2024), Portuguese pacifist worker Francisco José Caeiro (1890–1976), Portuguese politician João Caeiro (died 1548), Portuguese mercenary José Caeiro (1925–1981), Spanish footballer Teresa Caeiro (1969–2025), Portuguese lawyer and politician Tiago Caeiro (born 1984), Portuguese footballer
See also Alberto Caeiro, heteronym of Fernando Pessoa