Seixas ( or ) is a common Galician and Portuguese surname. It may refer to:

• Carlos Seixas – Portuguese composer of the 18th century

• Gershom Mendes Seixas – minister of Congregation Shearith Israel

• Francisco Seixas da Costa – Portuguese diplomat and former politician

• Vic Seixas (1923–2024) – American top-10 tennis player

• Raul Seixas – Brazilian rock musician

• Alberto Seixas Santos – Portuguese film director

• Ponta do Seixas – easternmost point of South America

• Paul Seixas - French cyclist