Cassius Marcellus Clay may refer to:

• Cassius Marcellus Clay (politician) (1810–1903), American politician and abolitionist
• Cassius Marcellus Clay Sr. (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

Topics referred to by the same term

This disambiguation page lists articles about people with the same name.
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