Dennis O'Sullivan may refer to:

• Dennis O'Sullivan (American football) (born 1976), American football player
• Dennis O'Sullivan (Australian footballer) (born 1946), for the Carlton Football Club
• Dennis O'Sullivan, see Roman Catholicism in Liberia

• Denis O'Sulivan (disambiguation)
• Dennis Sullivan (disambiguation)

Topics referred to by the same term

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