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Halgerda willeyi is a species of sea slug. It is a dorid nudibranch, and shell-less marine gastropod mollusk in the family Discodorididae. The body of the Halgerda willeyi is rigid, with soft curves and various colours. White or gray with interconnected yellow-topped ridges and numerous black and yellow lines between. This species is a fairly large halgerdid, and can reach 8 cm.
Halgerda willeyi can be found throughout the western Indo-Pacific, including Taiwan, Vietnam, Myanmar, Egypt, Indonesia, Malaysia and Australia and in the Red Sea.