Cassius Marcellus Clay may refer to:
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Cassius Marcellus Clay (politician) (1810–1903), American politician and abolitionist
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Cassius Marcellus Clay Sr.
Cassius Marcellus Clay (November 11, 1912 – February 8, 1990) was an American painter and musician. He was the father of three-time World Heavyweight Champion Muhammad Ali and Rahman Ali, and the paternal grandfather o ...
(1912–1990), American painter and musician, named after the abolitionist, father of the boxer
*Cassius Marcellus Clay Jr. or
Muhammad Ali (1942–2016), American boxer
{{hndis, Clay, Cassius Marcellus