- ea-luna by Mia Soderquist (25 features)
- Ebisedian by H. S. Teoh (32 features)
- Ebma by teeohbeewye (103 features)
- Ebo Lingai by k1234567890y (97 features)
- Edebro by J. Thomas Crisler (62 features)
- Edievian by Brandon Ennis (14 features)
- Eezee by Todd Moyer (141 features)
- Egeriac by k1234567890y (127 features)
- Eiidana by Eiivodan (142 features)
- Eitinodo by Becca (53 features)
- Eiyrnas by Manofzelego (24 features)
- Ekorat by Andrés R (59 features)
- Elanian by Thavernes (42 features)
- Eldoeysk by Ruben Drott (96 features)
- Eldtyric by Beverly (15 features)
- Elesemantium by Beklemishev-Petrov I. (0 features)
- Elesu by con quesa (35 features)
- Elias Savolainen by Poiponen (16 features)
- Elko by Ziecken Azuris (0 features)
- Ellarte by Kiriyow (0 features)
- Elmoric by Ben Felix (0 features)
- Emeranye by Solarius (145 features)
- Emihtazuu by sjiveru (137 features)
- EML by Maus_Rawr (56 features)
- Emnonian by Personak (46 features)
- Empolese by Adrià (53 features)
- Emyt by Milyamd (115 features)
- Enamyn by Peter (66 features)
- Endehl by Uiri, Ienpw_III, Fenhl, Rorschach (129 features)
- Eneqa by Michael Gunter (76 features)
- Enlalen by sparksbet (97 features)
- Ensurti by Ambery (57 features)
- Enterdese by Escodrion (67 features)
- Eranai by Lymia (109 features)
- Eremoran by Mocha (143 features)
- Eridanian by Taylor Selseth (141 features)
- Ernalan by Becca (87 features)
- Esata by Pafu Bothi (113 features)
- Eskayan by Eskayan is an auxiliary language from the Philippines. It follows the grammar of Boholano. (0 features)
- Esperanto by Ludwik Leyzer Zamenhof (140 features)
- Esperanto 1894 by L. L. Zamenhof (35 features)
- Esturean by Justin Gagnon (0 features)
- Etelegbe by Becca (112 features)
- Etlish by Dillon Hartwig (143 features)
- Europanto by Diego Marani (1 feature)
- Ewheshenin by Ben Felix (19 features)
- ExoticLang by Bryony (84 features)