• Tetaris Chesney, 1868 (uncertain)
• Tetracis Guenée, 1857 [Family: Geometridae]
• Tetracis Sharp, 1874 accepted as Desimia Reitter, 1881 [Family: Staphylinidae]
• Tetracus Aymard, 1850 †
• Tetrada Neckaja, 1958 †
• Tetrades Bleeker, 1864 accepted as Dascyllus Cuvier, 1829
• Tetradia Du Petit-Thouars ex Tulasne, 1856 (unaccepted) [Family: Lythraceae]
• Tetradia R. Brown, 1844 accepted as Pterygota H.W. Schott & Endlicher, 1832 [Family: Malvaceae]
• Tetradia T. Johnson, 1904 [Family: Ascomycota incertae sedis]
• Tetradia Thomson, 1864 [Family: Cerambycidae]
• Tetradoa Pichon, 1947 accepted as Pleiocarpa Bentham in Bentham & J.D. Hooker, 1876
• Tetradon Scopoli, 1777 accepted as Tetraodon Linnaeus, 1758
• Tetradyas Danser, 1931 accepted as Cyne Danser, 1929
• Tetragus Duarte & Grossi, 2022
• Tetramys Iwata, 1957
• Tetrao Linnaeus, 1758
• Tetraodes Blanchard, 1853 accepted as Baripus Dejean, 1828
• Tetrapus Mayr, 1885 (uncertain)
• Tetrax Forster, 1817 [Family: Otididae]
• Tetrax Leach, 1816 (uncertain) [Family: Aves (awaiting allocation)]
• Tetrias Rathbun, 1898
• Tetroda Amyot & Serville, 1843
• Tetrodus (Cassini) Lessing, 1832 accepted as Helenium Linnaeus, 1753
• Tetrops Kirby, 1826 accepted as Tetraopes Dalman in Schönherr, 1817
• Tetrops Stephens, 1829