原甲藻目（Prorocentrales） 为藻类植物之一植物目。该植物于植物分类表上，归于甲藻门 （Pyrrophyta）纵裂甲藻纲（Desmophyceae）。

The Prorocentrales are a small order of dinoflagellates. They are distinguished by having their two flagella inserted apically, rather than ventrally as in other groups. One flagellum extends forward and the other circles its base, and there are no flagellar grooves. This arrangement is called desmokont, in contrast to the dinokont arrangement found in other groups. Accordingly, the Prorocentrales may be called desmoflagellates, and in some classifications were treated as a separate class Desmophyceae.