Trapania vitta is a species of sea slug, a dorid nudibranch, a marine gastropod mollusc in the family Goniodorididae.

[2] This species was described from Bali, Indonesia with additional material from Luzon, Philippines.

[3] The body of this goniodorid nudibranch is opaque white.

The coloration is similar to Trapania aurata except that in that species the lateral papillae are tipped with orange.

[3] Trapania vitta probably feeds on Entoprocta which often grow on sponges and other living substrata.