- Trigonotylus tenuis Reuter, 1893
- Trigonotylus viridis (Provancher, 1872)
- Trigonotylus yangi Tang, 1994
- Trinithignus manto Linnavuori & Al Safadi, 1994
- Trinithignus themis Linnavuori & Van Harten, 2002
- Tripanda (Tenerva) decorata (Jensen-Haarup, 1937)
- Tripanda (Tripanda) Berg, 1899
- Tripanda (Tripanda) signitensis Distant, 1898
- Tritomegas bicolor (Linnaeus, 1758)
- Tritomegas delagrangei (Puton, 1888)
- Tritomegas micans (Horváth, 1899)
- Tritomegas rotundipennis (Dohrn, 1862)
- Tritomegas sexmaculatus (Rambur, 1839)
- Tritomegas theryi (Lindberg, 1932)
- Trochiscocoris hemipterus (Jakovlev, 1879)
- Trochiscocoris rotundatus aeneus Asanova & Kerzhner, 1969
- Trochiscocoris rotundatus Horváth, 1895
- Trochiscocoris rotundatus rotundatus Horváth, 1895
- Troilus luridus (Fabricius, 1775)
- Troilus testaceus L.Y. Zheng & G.Q. Liu, 1987
- Tropiconabis Kerzhner, 1968
- Tropidocheila Fieber, 1844
- Tropidophlebia costalis (Herrich-Schaeffer, 1850)
- Tropidophlebia subcarinata Muminov, 1973
- Tropidosteptes pacificus (Van Duzee, 1921)
- Tropidothorax autolycus (Distant, 1903)
- Tropidothorax cruciger (Motschulsky, 1860)
- Tropidothorax fimbriatus (Dallas, 1852)
- Tropidothorax leucopterus (Goeze, 1778)
- Tropidothorax sinensis (Reuter, 1888)
- Tropidothorax sternalis (Dallas, 1852)
- Tropidothorax sternalis saudiensis Hamid & Hamid, 1985
- Tropidothorax sternalis sternalis (Dallas, 1852)
- Tropidothorax wittmeri Hamid & Hamid, 1985
- Tropistethus fasciatus Ferrari, 1874
- Tropistethus holosericus (Scholtz, 1846)
- Tropistethus lanternae Linnavuori, 1960
- Tropistethus multilobatus Péricart, 1994
- Tropistethus nitidicollis Puton, 1887
- Tropistethus pallipes Reuter, 1902
- Tropistethus seminitens Puton, 1889
- Tropistethus subfasciatus Ferrari, 1874
- Tropocorixa Hutchinson, 1940
- Tshingisella bella Kiritshenko, 1913
- Tshingisella robusta Linnavuori, 1960
- Tuberculiformia subinermis (Blöte, 1934)
- Tunisiella linnavuorii Carapezza, 1997
- Tupiocoris annulifer (Lindberg, 1927)
- Tupiocoris rhododendri (Dolling, 1972)
- Tuponia (Chlorotuponia) anatolica Linnavuori, 1965