Luteuthis dentatus, also known as Lu's jellyhead,[3] is a medium-sized species of cirrate octopus found in the southwestern Pacific, originally described by Steve O'Shea.

Luteuthis dentatus reaches a relatively large size with disproportionately long arms.

The male holotype specimen from off New Zealand had a total length of 524 mm, while a large female from off Macquarie Island had a total length of 590 mm.

[4][3] The species was given the name dentatus because it has a radula, a tooth-like structure used for tearing food into pieces.

[3] Luteuthis dentatus was originally described from material collected in the waters around New Zealand, with two specimens being collected over a depth range of 991–1050 m.[5][6] The species has more recently been confirmed to also occur off Macquarie Island (Australian Antarctic Territories), with a single large specimen collected at 870–979 m depth.