Orthopsyche thomasi is a species of caddisfly belonging to the family Hydropsychidae. The species was first described by Keith Arthur John Wise in 1962, and is endemic to New Zealand.
The species was identified by Wise in 1962 as Hydropsyche thomasi, based on a specimen collected by a light trap in Titirangi, Auckland, in 1953. In 1976, Alex G. McFarlane identified the genus Orthopsyche, placing the species within it. Many taxonomic references such as the New Zealand Threat Classification System refer to the species as Hydropsyche thomasi.
Wise's original text (the type description) reads as follows:
The species is endemic to New Zealand, found in the northern half of the North Island.[1]