Donnacha is an Irish given name; a variant of Donnchadh. Notable people with the name include:

• Donnacha Cody (born 1985), Irish hurler for the Kilkenny senior team
• Donnacha Dennehy (born 1970), Irish composer
• Donnacha Fahy (born 1979), Irish hurler for Tipperary GAA
• Donnacha O'Brien (born 1998), Irish jockey
• Donnacha O'Dea (born 1948), Irish professional poker player and swimmer
• Donnacha Ryan (born 1983), Irish rugby union player
• Donnacha Costello, Irish composer

This page or section lists people that share the same given name.
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