Belemnitella bulbosa is a species of belemnite from the Late Cretaceous of North America.

It is known only from two localities - the Pierre Shale and Fox Hills Formations.

B. bulbosa had a slender somewhat cylindrical rostrum (guard) with a slightly expanded front opening.

Like other members of the genus Belemnitella, it had a dorsal ridge on the rostrum.

The phragmocone is about the same size or slightly longer than the rostrum and has an oval cross-section.