- Termatophylum hikosanum Miyamoto, 1965
- Termatophylum insigne Reuter, 1884
- Termatophylum montanum Ren, 1983
- Termatophylum nigrum Poppius, 1910
- Termatophylum orientale Poppius, 1915
- Termatophylum yunnanum Ren, 1983
- Tessaratoma furcifera Walker, 1868
- Tessaratoma papillosa (Drury, 1773)
- Tessaratoma quadrata Distant, 1902
- Tessaromerus quadriarticulatus Kirkaldy, 1908
- Tessaromerus shaanxiensis Z.M. Zheng, 1982
- Tessaromerus tuberlosus Hsiao & Ching, 1977
- Tethallotrum heteronotum (Puton, 1886)
- Tethallotrum longicolle Linnavuori, 1978
- Tetraphleps alashanensis Tong & Nonnaizab, 2008
- Tetraphleps aterrima (J. Sahlberg, 1878)
- Tetraphleps bicuspis (Herrich-Schaeffer, 1835)
- Tetraphleps galchanoides Ghauri, 1972
- Tetraphleps maculatus Tong & Nonnaizab, 2008
- Tetraphleps parallela Bu & Zheng, 1991
- Tetraphleps pilosula Bu & Zheng, 1991
- Tetraphleps yulongensis Bu & Zheng, 1991
- Tetrarthria variegata Dallas, 1851
- Tetrarthria yangi Y.J. Lin & S.M. Zhang, 1999
- Tetroda histeroides (Fabricius, 1798)
- Thaumastella aradoides Horváth, 1896
- Thaumastocoris peregrinus Carpintero & Dellapé, 2006
- Thaumastopus cinnamomeus (Horváth, 1884)
- Thaumastopus impressicollis (Lucas, 1849)
- Thaumastopus marginicollis (Lucas, 1849)
- Thebanus politus Distant, 1903
- Thermocoris discolor Seidenstücker, 1957
- Thermocoris munieri Puton, 1875
- Thermocoris rivalis (Horváth, 1894)
- Thermocoris rivalis rivalis (Horváth, 1894)
- Thermocoris rivalis suctor Seidenstücker, 1957
- Thiomiris sulphureus (Reuter, 1879)
- Thirumalai kaara Matsushima, 2022
- Thodelmus falleni Stål, 1859
- Tholagmus acutangulus Linnavuori, 1984
- Tholagmus breviceps Jakovlev, 1883
- Tholagmus chobauti Puton, 1898
- Tholagmus enkidu Linnavuori, 1984
- Tholagmus flavolineatus (Fabricius, 1798)
- Tholagmus strigatus (Herrich-Schaeffer, 1835)
- Thunbergia marginata (Thunberg, 1822)
- Thunbergia sanguinaria (Stål, 1871)
- Thyreocoris balcanicus Schumacher, 1918
- Thyreocoris fulvipennis (Dallas, 1851)
- Thyreocoris ohridanus Kormilev, 1936