Lachneratus phasmaticus, also known as the phantom cardinalfish, is a species of fish in the family Apogonidae, the cardinalfishes. It is the only member of its genus. It is native to the tropical eastern Pacific and Indian Oceans. This fish can be found in crevices and underwater caves, and it occurs at depths of 3 to 104 m (10 to 340 ft). It grows to a standard length of 7.4 cm (2.9 in).

This species was discovered when "an unusual cardinalfish was taken in a trawl off of Hawaii" around 1969. It was later collected off of Fiji. It was described to science in 1991 and placed in a new genus.

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