Embletonia gracilis is a species of sea slug, a dorid nudibranch shell-less mollusk in the family Embletoniidae.

[1] Embletonia gracilis is translucent white, and has been described to be less than 8mm, but can grow to be 20-30mm in length.

They have an elongated shape and a single row of cerata, which divide into four parts at the tip, containing nematocysts.

Several studies suggest that they eat hydroids.

The species has a large distribution across the West Indo-Pacific.