Trimeresurus tokarensis is a venomous pitviper species endemic to the Tokara Islands of Japan. No subspecies are currently recognized.
Scalation includes 31 (31-33) rows of dorsal scales at midbody, 199-210 ventral scales, 72-84 subcaudal scales, and 8 (7-9) supralabial scales.
Found in Japan on the islands of Takara-jima and Kotakara-jima. According to Golay et al. (1993), the type locality is "Takara-jima, province of Kagoshima, Ryukyu Islands".