Olin platnicki is the only species in the monotypic spider genus Olin in the family Trachycosmidae. It is native to Christmas Island and Sulawesi.
The genus and species were first described in 2001 by Christa L. Deeleman-Reinhold. The generic name "Olin" was a random combination of letters, and the specific name "platnicki" is in honour of Norman Platnick.
Olin has long and projected chelicerae, and a relatively broad and low carapace, with the maxillae long and nearly parallel, with depressions laterally. There is little sexual dimorphism and no elongation on the fourth trochanter or coxae.