Kevin O'Hara is the name of:

• Kevin O'Hara, pseudonym of Marten Cumberland
• Kevin O'Hara (footballer) (born 1998), Scottish footballer

• Mark Whitfield
• Mark W. Holsten
• Mark Whyte
• Mark Wiebe
• Mark Wigglesworth
• Mark Wigley
• Mark Wilcox
• Mark Wilding
• Mark Wilkerson
• Mark Wilkerson (conscientious objector)
• Mark Wilkes
• Mark Wilkes Collet
• Mark Wilkins
• Mark Wilkins (racing driver)
• Mark Wilks Collet, 1st Baronet, of St. Clere, Kent
• Mark Wilks Collet, 1st Bt, of St. Clere, Kent
• Mark Willard (Tomb Raider)
• Mark William Calaway
• Mark William Clark
• Mark William Hoffman
• Mark William Hofman
• Mark William Holsten
• Mark Williams (AFL footballer)
• Mark Williams (AFL footballer and coach)
• Mark Williams (Australian footballer, born 1983)