Mangelia dubia is an extinct species of sea snail, a marine gastropod mollusk in the family Mangeliidae.
This is not Mangelia dubia <small>(C. B. Adams, 1845)</small> (synonym of Tenaturris dubia <small>(C. B. Adams, 1845)</small>) (preoccupied by Pleurotoma dubia <small>Cristofori & Jan, 1832</small>)
This extinct marine species was found in Pliocene strata in Suffolk, UK.