Stiphodon martenstyni, the Martenstyn's stiphodon or Martenstyn's goby, is a species of amphidromous freshwater goby endemic to the southwestern portion of Sri Lanka.

The males of this species can reach a length of 3.4 centimetres (1.3 in) SL.

[2] The specific name martenstyni is named in memory of Cedric Martenstyn, who was a leading naturalist of the country killed by the Tamil militant organization Liberation Tigers of Tamil Eelam (LTTE).

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