Taxa named by Thaddeus William Harris

Hippotragus is a genus of antelopes which includes two living and one recently extinct species, as well as some fossil relatives. The genus name comes from Ancient Greek ἵππος (híppos), meaning "horse", and τράγος (trágos), meaning "he-goat", and thus, "horse goat". {| class="wikitable" |- ! Image !! Scientific name !! Common name !! Distribution |- |120px || H. equinus || Roan antelope || West, Central, East and Southern Africa |- |120px || H. niger || Sable antelope || East Africa, south of Kenya, and Southern Africa |- |120px || H. leucophaeus || †Bluebuck or blue antelope || the southweste

Ceratomia is a genus of hawkmoths (family Sphingidae). The genus was erected by Thaddeus William Harris in 1839. Species include:

Hyphantria is a genus of tiger moths in the family Erebidae. The genus was erected by Thaddeus William Harris in 1841. The moths are primarily found in North and Central America. One species, Hyphantria cunea, was introduced in Eurasia.

Macroglossini is a tribe of moths of the family Sphingidae described by Thaddeus William Harris in 1839.

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