Hypselodoris iba is a species of sea slug or dorid nudibranch, a marine gastropod mollusc in the family Chromodorididae.

This nudibranch was described from 35 m (115 ft) depth at Aphol’s Reef, Tingloy, Maricaban Island, Batangas, Philippines, 13°39′31″N 120°54′05″E / 13.6586°N 120.90129°E / 13.6586; 120.90129.

Typically it has a violet semi-translucent body with a bright opaque white margin to the mantle.

The violet colouration can be absent and replaced by milky white or present just as a more intense inner border to the mantle.

In these pale colour forms there is usually a brown patch in the middle of the back, edged with violet.