Marionia distincta is a species of sea slug, a dendronotid nudibranch, a marine gastropod mollusc in the family Tritoniidae.

[2] This species was described from station 315, the anchorage at Pulau Sailus Besar, Paternoster Islands (Tengah Islands, 7°32′16″S 117°26′34″E / 7.5378°S 117.4427°E / -7.5378; 117.4427) from a dredge with maximum depth of 36 m and a seabed of coral and Lithothamnion.

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