Sepia dubia is a species of cuttlefish native to the southeastern Atlantic Ocean. It is known only from the type locality, where it was caught at a depth of 25 m.

Sepia dubia is known to grow to a mantle length of 17 mm.

The type specimen was collected in False Bay, South Africa (34°11′S 18°27′E). It is deposited at The Natural History Museum in London.

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