Iniistius twistii, the redblotch razorfish, is a species of marine ray-finned fish from the family Labridae, the wrasses. It is found in the western Pacific Ocean.
This species reaches a length of .
The fish is named in honor of Albertus Jacobus Duymaer van Twist (1809âÂÂ1887), the Governor-General of the Dutch East Indies who governed for five years from 1851 to 1856.