Seixas is a common Galician and Portuguese surname. It may refer to:
Carlos Seixas – Portuguese composer of the 18th century
Joshua Seixas – Hebrew teacher hired by the early Mormons at Kirtland
Gershom Mendes Seixas – minister of Congregation Shearith Israel
Francisco Seixas da Costa – Portuguese diplomat and former politician
Vic Seixas – American tennis player
Raul Seixas – Brazilian rock musician
Alberto Seixas Santos – Portuguese film director
Ponta do Seixas – easternmost point of South America
