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The Notobranchaeidae, or "naked sea butterflies", are a taxonomic family of floating sea slugs, specifically under the subclass Opistobranchia, also called "sea angels".

Similar to other Pteropods, these pelagic marine heterobranch gastropod mollusks are holoplanktonic and generally appear in high concentrations, resulting in them frequently playing important roles in major role in planktonic food webs. While they are not particularly strong swimmers, the foot of these organisms are modified it to wing-like structures that they employ for locomotion. Additionally, like other Pteropods of the order Gymnosomata, Notobrachaeidae lack shells entirely. They are also defined by how they possess a posterior gill and usually possess buccal cones.

They are carnivores, equipped with swimming parapodia (fleshy wing-like flaps), strong jaws, and grasping tentacles, often with suckers resembling those of cephalopods.