Bela decussata is a species of sea snail, a marine gastropod mollusk in the family Mangeliidae.
The accepted name of this species is neither a primary homonym, nor currently a secondary homonym of Bela decussata (Couthouy, 1839), synonym of Curtitoma decussata (Couthouy, 1839) (originally described as Pleurotoma decussatum)
The length of the shell attains 5 mm.
This marine species occurs in Atlantic France.