Tetradactylus ellenbergeri, commonly known as Ellen's whip lizard and Ellenberger's long-tailed seps, is a species of lizard in the family Gerrhosauridae.

The specific name, ellenbergeri, is in honor of Victor Ellenberger (1879–1972), who was an African-born Swiss missionary and naturalist.

[3] T. ellenbergeri is found in Angola, Democratic Republic of the Congo, Tanzania, and Zambia.

[2] The preferred natural habitats of T. ellenbergeri are savanna and grassland.

The tail is extremely long, more than three times the snout-to-vent length (SVL).