Sepia koilados is a species of cuttlefish native to the southeastern Indian Ocean, specifically the North West Shelf in western Australia (18°31′S 118°09′E to 19°12.6′S 116°25.8′E). It lives at depths of between 182 and 203 m.

Males are slightly larger than females. They grow to a mantle length of 68 mm and 58 mm, respectively.

The type specimen was collected in the North West Shelf (18°36′S 118°02′E to 18°39′S 118°04′E). It is deposited at the Museum of Victoria in Melbourne.

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