Eumenes may refer to:

• Eumenes of Cardia (c. 362 BC - 316 BC), a general and scholar in Ancient Greece
• Several members of the ruling Attalid dynasty of Pergamon
  • Eumenes I (ruled 263 BC - 241 BC)
  • Eumenes II (ruled 197 BC - 160 BC)
  • Eumenes III (died 129 BC), illegitimate son of Eumenes II and pretender to the throne
• Eumenes, a late third century BC sculptor of the Pergamene school
• Eumenes of Bactria, an associate king of Antimachus I of Baktria
• Saint Eumenes, a 7th-century bishop of Gortyna
• Eumenes (wasp), a genus of potter wasps

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