Diogenes the Cynic (, dy-OJ-in-eez; c. 413/403 – c. 324/321 BC), also known as Diogenes of Sinope, was an ancient Greek philosopher and one of the founders of Cynicism. Renowned for his ascetic lifestyle, biting wit, and radical critiques of social conventions, he became a legendary figure whose life and teachings have been recounted, often through anecdote, in both antiquity and later cultural traditions.

Diogenes was born to a prosperous family in Sinope. His life took a dramatic turn following a scandal involving the debasement of coinage, an event that led to his exile and ultimately his radical rejection of conventional values. Embracing a life of poverty and self-sufficiency, he became famous for his unconventional behaviours that openly challenged societal norms, such as living in a jar or wandering public spaces with a lit lantern in daylight, claiming to be "looking for a man", that is to say "for a wise man" (sophos). Diogenes advocated for a return to nature, the renunciation of materialism, and introduced early ideas of cosmopolitanism by proclaiming himself a "citizen of the world". His memorable encounters, including that with Alexander the Great, along with various accounts of his death, have made him a lasting symbol of philosophical defiance to established authorities and artificial values.

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