This article is about the king of Thebes. For the insect genus, see Nycteus (beetle). For other mythological people, see Nycteus (mythology).
In Greek mythology, Nycteus (/ˈnɪktjuːs/; Greek: Νυκτεύς, romanized: Nukteús, lit.'nocturnal') was a king of Thebes. His rule began after the death of Polydorus, and ended when he was succeeded by his brother Lycus.