Rhamphastosula ("toucan booby") is an extinct genus of sulid bird known from fossils discovered in early Pliocene rocks of Peru.

The genus name is a combination of "Rhamphastos", "toucan" and "sula", an Icelandic word for "fool" that has been used to describe boobies (Sulidae, Sula) in general.

[1] Rhamphastosula is known from a partial skull that has bony characters placing it in the booby family Sulidae.

Unlike living boobies, it has a large bill with a convex upper mandible, reminiscent of a toucan.

The remains were recovered from the west side of Sud Sacaco Level (4–5 Million year-old) of the Pisco Formation.