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Martin O'Brien may refer to:

Martin O'Brien (artist), British performance artist
Martin O'Brien (journalist), Irish journalist and author.
Martin O'Brien (footballer) (1875–1946), Australian rules footballer
Martin O'Brien (humanitarian) (born 1964), human rights activist and charity administrator in Northern Ireland
Martin O'Brien (hurler) (1885–1958), Irish hurler

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