''Hypselodoris bullockii'' is a species of colorful sea slug or dorid nudibranch, a marine gastropod mollusk in the family Chromodorididae.
''Hypselodoris bullockii'' is quite variable in color. ''Hypselodoris apolegma'', which looks similar to this species , and was assumed to be possibly a different color form of ''H. bullockii''. However, recent phylogenetic data confirm the distinction of the two species, and suggest a sister species relationship between them.
This nudibranch is found in the Tropical Western Pacific Ocean and the eastern Indian Ocean.
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