Charles Léopold Mayer (1881–1971) was a French biochemist, humanist and materialist philosopher.

[3] Mayer called his doctrine "sensationalism" which he equated with the irritability of living matter.

He argued that organisms only know the world by their sensations and that this is a mechanical phenomenon to the effect that there is no design, final cause, supernaturalism or teleology.

[4] He subscribed to the materialist views of Epicurus, he commented that "in human affairs, Epicureanism is the only natural ethics which does not demand profound or subtle reasoning.

[7] Mayer defined his "progressionistic materialism" as a form of humanism, a "conception of life which may be capable of satisfying our highest and deepest needs.