Nonnus (Ancient Greek: Νόννος, Nónnos) usually refers to Nonnus of Panopolis, a Hellenized Egyptian who wrote the longest-surviving epic poem from antiquity, the Dionysiaca.

Nonnus may also refer to:

• Nonnus (wasp), a genus of wasps
• St Nonnus, a probably legendary Syrian bishop from the hagiography of St Pelagia
• Nonnus of Edessa, bishop, frequently but probably mistakenly conflated with St Nonnus and with Nonnus of Panopolis
• Nonnus of Zerabenna, bishop
• Nonnus (historian) (6th-century), better known as Nonnosus
• Theophanes Nonnus, a 10th-century Byzantine physician
• Pseudo-Nonnus also called Nonnus Abbas (i.e. "Nonnus the Abbot"), a 6th-century AD commentator on Gregory Nazianzen

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