Sueiro Gomes de Soutomaior (1417 - ca.1490) was an important aristocrat in the kingdom of Galicia during the 15th century, heir to a lineage dating back at least to his great-grandmother, the great admiral and Galician earl Pai Gomes Charinho.

He lived a hard time with serious tensions between nobles and peasants, was lord of Lantañón, Rianxo, Insua and Vea, bearing the title of marshal.

Since the victory against the armies headed by Alonso de Lanzos and the archbishop Fonseca, it's told that Sueiro self-proclaimed "Marshal."

During the War of the Castilian Succession when was disputed the legitimacy between Elizabeth and Joanna of Castile, nicknamed by his enemies, "La Beltraneja".

Sueiro was politically neutral, but he never was opposed to a possible integration of the kingdom of Galicia in the Portuguese crown, as dowry of Princess Joanna.