Daniel O'Brien

Daniel O'Brien may refer to:

Daniel O'Brien, 1st Viscount Clare, MP for County Clare, younger son of Connor O'Brien, 3rd Earl of Thomond
Daniel O'Brien, 3rd Viscount Clare, son of Connor O'Brien, 2nd Viscount Clare
Daniel O'Brien, 4th Viscount Clare (died 1693), son of Daniel O'Brien, 3rd Viscount Clare
Dan O'Brien, decathlete
Dan O'Brien (author)
Dan O'Brien (baseball executive)
Dan O'Brien (pitcher) (born 1954), American baseball player, see 1979 St. Louis Cardinals season
Dan O'Brien Sr. (baseball)
Dan O'Brien (playwright)
Dan O'Brien (sports journalist), who is also an author and screenwriter
Danny O'Brien, English technology journalist
Danny O'Brien (American football), American college football quarterback
Daniel O'Brien (comedian), internet comedian and Senior Writer for Cracked

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