| Subject | English | Icelandic |
| bot. | common bent | halingresi (Agrostis capillaris L.; Agrostis tenuis Sibth.; Agrostis vulgaris With.) |
| bot. | common bird's-foot-trefoil | þyriltunga (Lotus corniculatus L.) |
| bot. | common bog-sedge | flóastör (Carex limosa L.) |
| bot. | common chickweed | haugarfi (Stellaria media (L.) Vill.) |
| bot. | common club-rush | votasef (Schoenoplectus lacustris (L.) Palla; Scirpus lacustris L.) |
| fish.farm. | common cockle | hjartaskel (Cardium corbis, Cardium edule, cerastoderma edule) |
| bot. | common cottongrass | marghneppa (Eriophorum angustifolium Honck.; Eriophorum polystachyum L.; Eriophorum angustifolium Honck. ssp. subarcticum (V. N. Vassil.) Hultén (ssp. angustifolium)) |
| bot. | common cottongrass | klófífa (Eriophorum angustifolium Honck.; Eriophorum polystachyum L.; Eriophorum angustifolium Honck. ssp. subarcticum (V. N. Vassil.) Hultén (ssp. angustifolium)) |
| bot. | common couch | husapuntur (Elytrigia repens (L.) Desv. ex Nevski; Agropyron repens (L.) P. Beauv.; Elymus repens (L.) Gould; Triticum repens L.; Elymus repens (L.) Gould ssp. arenosa (Spenn.) Melderis; Elytrigia repens (L.) Desv. ex Nevski var. maritima (W. D. J. Koch & Ziz) Hyl. (ssp. arenosa)) |
| bot. | common cudweed | ulljurt (Filago vulgaris Lam.; Filago germanica L.) |
| bot. | common dog-violet | skógfjóla (Viola riviniana Rchb.) |
| fish.farm. | common dolphin | höfrungur (Delphinus delphis delphis) |
| math. | common factor | sameiginlegur þáttur |
| math. | common factor space | sameiginlegur þáttur rúm |
| math. | common factor variance | sameiginlegur þáttur dreifni |
| bot. | common hemp-nettle | hjálmgras (Galeopsis tetrahit L.; Galeopsis carthusianorum auct.) |
| bot. | common juniper | einir (Juniperus communis L.) |
| comp., MS | common language runtime | CLR (The engine at the core of managed code execution. The runtime supplies managed code with services such as cross-language integration, code access security, object lifetime management, and debugging and profiling support) |
| bot. | common mouse-ear | vegarfi (ssp. fontanum, Cerastium fontanum Baumg.; Cerastium caespitosum Gilib. ssp. alpestre (Lindblom ex Fr.) Lindm.; Cerastium fontanum Baumg. ssp. scandicum Gartner (ssp. fontanum); Cerastium caespitosum Gilib.; Cerastium fontanum Baumg. ssp. triviale (Link) Jalas; Cerastium holosteoides Fr.; Cerastium vulgare Hartm.; Cerastium vulgatum L. (ssp. vulgare); Cerastium holosteoides Fr. var. vulgare (Hartm.) Hyl. (ssp. vulgare var. vulgare); Cerastium holosteoides Fr.; Cerastium holosteoides Fr. var. glabrescens (G. Mey.) Hyl. (ssp. vulgare var. holosteoides); Cerastium holosteoides Fr. var. kajanense (Kotil. & Salmi) Hyl. (ssp. vulgare var. kajanense)) |
| bot. | common nettle | sérbýlisnetla (Urtica dioica L.; Urtica galeopsifolia Wierzb. ex Opiz (ssp. dioica var. holosericea); Urtica dioica L. ssp. gracilis auct.; Urtica dioica L. var. sondenii Simmons; Urtica sondenii (Simmons) Avrorin ex Geltman (ssp. sondenii)) |
| bot. | common orache | fjöruhriblaðka (Atriplex patula L.) |
| fish.farm. | common oyster | ostra (Ostrea edulis) |
| fish.farm. | common prawn | rækja (Palaemon serratus, leander serratus) |
| bot. | common saltmarsh-grass | sjávarfitjungur (Puccinellia maritima (Huds.) Parl.; Glyceria maritima (Huds.) Wahlenb.) |
| bot. | common scurvy grass ssp. officinalis | skarfakál (Cochlearia officinalis L.; Cochlearia anglica L.; Cochlearia officinalis L. var. anglica (L.) Alef. (ssp. anglica)) |
| bot. | common sedge | mýrastör (Carex nigra (L.) Reichard; Carex fusca All.; Carex goodenowii J. Gay; Carex stolonifera Hoppe; Carex vulgaris Fr.; Carex subcaespitosa (Kük.) Wiinst. (ssp. nigra var. recta); Carex goodenowii J. Gay ssp. juncea (Fr.) Lindm.; Carex juncella (Fr.) Th. Fr.; Carex nigra (L.) Reichard var. juncea (Fr.) Hyl. (ssp. juncella)) |
| fish.farm. | common shore crab | krabbi (Carcinus maenas, carcinus mediterraneus) |
| fish.farm. | common shrimp | hrossarækya |
| fish.farm. | common sole | sölflúra (Solea vulgaris vulgaris, solea solea) |
| bot. | common sorrel | túnsúra (Rumex acetosa L.; Acetosa pratensis Mill.; Rumex acetosa L. ssp. pratensis (Wallr.) A. Blytt & O. C. Dahl; Rumex haematinus Kihlm. (ssp. acetosa); Rumex acetosa L. ssp. serpentinicola (Rune) Nordh. (ssp. acetosa var. serpentinicola); Rumex alpestris auct.; Rumex alpestris ssp. lapponicus (Hiitonen) Jalas; Rumex arifolius auct. (ssp. lapponicus)) |
| bot. | common spike-rush | votasef (Eleocharis palustris (L.) Roem. & Schult.; Scirpus palustris L.; Eleocharis palustris (L.) Roem. & Schult. ssp. microcarpa Walters (ssp. palustris); Scirpus palustris L. ssp. vulgaris (Walters) Hultén (ssp. vulgaris)) |
| bot. | common spotted-orchid ssp. fuchsii | brönugras (Dactylorhiza maculata (L.) Soó; Dactylorchis maculata (L.) Verm.; Orchis maculata L.; Dactylorhiza maculata (L.) Soó ssp. elodes (Griseb.) Soó (ssp. maculata); Dactylorchis fuchsii (Druce) Verm.; Dactylorhiza fuchsii (Druce) Soó; Dactylorhiza longebracteata auct.; Orchis fuchsii Druce; Orchis maculata L. ssp. fuchsii (Druce) C. A. Jörg.; Orchis maculata L. var. meyeri Rchb. f. (ssp. fuchsii)) |
| bot. | common stork's-bill | hegranef (Erodium cicutarium (L.) L'Hér.; Erodium danicum K. Larsen) |
| bot. | common toadflax | gullsporablom (Linaria vulgaris Mill.; Antirrhinum linaria L.) |
| bot. | common valerian | lækjabruða (Valeriana sambucifolia J. C. Mikan; Valeriana excelsa Poir.; Valeriana officinalis L. ssp. sambucifolia (J. C. Mikan) Celak.; Valeriana officinalis L. ssp. repens (Host, ssp. procurrens); Valeriana excelsa Poir. ssp. salina (Pleijel) Hiitonen; Valeriana officinalis L. ssp. salina (Pleijel); Valeriana salina Pleijel (ssp. salina)) |
| bot. | common vetch | sumarflækja (ssp. nigra, Vicia sativa L.; Vicia angustifolia L. ssp. angustifolia; Vicia angustifolia L. var. bobartii E. Forst.; Vicia sativa L. ssp. angustifolia (L.) Asch. & Graebn. (ssp. nigra); Vicia angustifolia L. ssp. segetalis (Thuill.) Celak. (ssp. segetalis)) |
| bot. | common vetch | akurflækja (ssp. sativa, Vicia sativa L.; Vicia angustifolia L. ssp. angustifolia; Vicia angustifolia L. var. bobartii E. Forst.; Vicia sativa L. ssp. angustifolia (L.) Asch. & Graebn. (ssp. nigra); Vicia angustifolia L. ssp. segetalis (Thuill.) Celak. (ssp. segetalis)) |
| bot. | common water-starwort | laugabrúða (Callitriche stagnalis Scop.) |
| bot. | common whitlowgrass | vorperla (Erophila verna (L.) Chevall.; Draba verna L.; Erophila duplex Winge) |
| bot. | common wintergreen | klukkublóm (Pyrola minor L.) |