Cyd is a given name, and may refer to:

• Cyd Adams (1949–2005), American poet and academic
• Cyd Charisse (1922–2008), American dancer and actress
• Cyd Gray (born 1973), Trinidad and Tobago footballer
• Cyd Hayman (born 1944), English actress
• Cyd Ho (born 1954), full-time legislative councillor of Hong Kong's Legislative Council
• Cyd Zeigler Jr (born 1973), American sportswriter

In fiction:

• Cyd Sherman, more commonly referred to by her in-game alias "Codex", the central character of web series The Guild