Felimare fregona is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusk in the family Chromodorididae.
The body is elongate, narrow, with the posterior portion of foot extending beyond the mantle margin. Background color is white with irregular shades of pale blue and gray. Dorsum is with three longitudinal yellow lines. Mantle margin is edged by an opaque white line with a narrow submarginal band of yellow and a series of black circular spots. Rhinophores are white with a purple longitudinal line up from the base. It is up to 40 mm long.
This species was described from Pointe sur baie de Baille Argent, Guadeloupe, 16°15′N 61°48′W / 16.250°N 61.800°W / 16.250; -61.800. Distribution of Felimare fregona includes Venezuela, Puerto Rico, Virgin Islands, Curaçao, Guadeloupe and Panama.
Felimare fregona feeds on a blue sponge.
