Lichtenstein's seahorse (Hippocampus lichtensteinii) is a species of fish in the family Syngnathidae.

The seahorse is named in honor of zoologist Martin Heinrich Carl Lichtenstein (1780-1857) of the Museum für Naturkunde Berlin, who provided the type specimen.

Lichtenstein's seahorse is pale brown in colour without markings.

Its coronet is high, columnar or knob-like, lacking spines.

[1] Lichtenstein's seahorse is found in the Western Indian Ocean and the Red Sea.