Reptilian may refer to:

• Reptiles and their qualities
• Reptilians, malevolent reptilian humanoids featured in conspiracy theories and alien abduction accounts
• List of reptilian humanoids, reptilian humanoids in fiction and mythology generally
• Reptilian (film), the American title for the 1999 South Korean kaiju film remake of Yonggary (1967)
• Reptilian (album), album by the Norwegian extreme metal group Keep of Kalessin
• "Reptilia", music single by The Strokes
• Reptilian complex (brain theory)
• Reptilians, album by the American electronica band Starfucker

Reptilian är det femte studioalbumet av det norska black/extreme metal-bandet Keep of Kalessin. Albumet gavs ut 10 maj 2010 av Indie Recordings i Nordeuropa och ges ut av Nuclear Blast 8 juni i övriga Europa och Nordamerika. Albumet placerade sig på andra plats på norska albumlistan.