Gustavo Bueno Martinez was a Spanish philosopher.

Gustavo Bueno was the main proponent of the philosophical system known as philosophical materialism. Philosophical materialism excludes any possibility of spiritual life without reference to organic life. Its ontology and theories of knowledge are not based on mechanic materialism or dualistic historical materialism, but in a rich interpretation of the main systems defended by the different traditions available in the History of Philosophy.

The founder of academic (scholar) philosophy, Plato, defended in Sophist, from the point of view of his theory of knowledge, the principle of Symploké that Bueno uses to support both determinism and pluralism: «nothing is isolated from everything else, but not everything is connected to everything else; otherwise, nothing could be known.»