Cardy is a surname. Notable people with the surname include:

• Alan Cardy, representative of Australia in rugby union
• Dominic Cardy (born 1970), English born Canadian politician
• John Cardy, British theoretical physicist
• Julien Cardy (born 1981), midfielder in the French Football League
• Nick Cardy (1920–2013), American comic book artist
• Peter Cardy, British activist

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