Sepia tokioensis is a species of cuttlefish native to the western Pacific Ocean, specifically Japanese waters from Tsugaru Strait to Kyà «shà « and the Ohsumi Islands, including Sagami Bay, Suruga Bay, the western Japan Sea, and Shimane Prefecture. It lives on the continental shelf.
Sepia tokioensis grows to a mantle length of 90 mm.
The type specimen was collected in Tokyo Bay and is deposited at the Musée zoologique in Strasbourg.