Felimare juliae is a species of sea slug or dorid nudibranch, a marine gastropod mollusc in the family Chromodorididae.
Felimare juliae is similar in appearance to Felimare picta with a dark blue background colour but is densely covered on the mantle and foot with fine longitudinal orange lines. The mantle has a frilly edge with a marginal orange line enclosing a series of larger pale blue spots and pale blue spots occur amongst the orange lines.
This species was described from a specimen measuring 57 mm (2.2 in) collected intertidally at Praia das Conchas, Cabo Frio, state of Rio de Janeiro, Brazil, 22°52′15″S 41°58′52″W / 22.87083°S 41.98111°W / -22.87083; -41.98111 and a paratype, from Ilha dos Papagaios, Cabo Frio 22°53′49″S 41°59′02″W / 22.89694°S 41.98389°W / -22.89694; -41.98389. Reported from Florida and probably present at intermediate localities in the western Atlantic Ocean.