Labrys
methylaminiphilus - monachus

Laceyella
putida - sacchari

Lachnobacterium
bovis

Lachnospira
multipara

Lactobacillus
acetotolerans - acidipiscis - acidophilus - agilis - algidus - alimentarius - amylolyticus - amylophilus - amylotrophicus - amylovorus - animalis - antri - apodemi - aviarius - backii - bifermentans - brevis - buchneri - casei - catenaformis - coleohominis - collinoides - concavus - coryniformis - crispatus - curvatus - delbrueckii - diolivorans - equi - farciminis - fermentum - fornicalis - fructivorans - frumenti - fuchuensis - gallinarum - gasseri - gastricus - graminis - hammesii - hamsteri - harbinensis - helveticus - hilgardii - homohiochii - iners - ingluviei - intestinalis - jensenii - johnsonii - kalixensis - kefiranofaciens - kefiri - kimchii - kitasatonis - kunkeei - lindneri - malefermentans - mali - manihotivorans - mindensis - mucosae - murinus - nagelii - nantensis - oligofermentans - oris - panis - pantheris - parabuchneri - paracasei - paracollinoides - parakefiri - paralimentarius - paraplantarum - pentosus - perolens - plantarum - pontis - psittaci - rennini - reuteri - rhamnosus - rossiae - ruminis - saerimneri - sakei - salivarius - sanfranciscensis - satsumensis - sharpeae - sobrius - sp. - spicheri - suebicus - ultunensis - vaccinostercus - vaginalis - versmoldensis - vini - vitulinus - zeae

Lactococcus
garvieae - lactis - piscium - plantarum - raffinolactis

Lactonifactor
longoviformis

Lamprocystis
roseopersicina

Lampropedia
hyalina

Laribacter
hongkongensis

Lautropia
mirabilis

Leadbetterella
byssophila

Lebetimonas
acidiphila

Lechevalieria
aerocolonigenes - flava

Leclercia
adecarboxylata

Leeuwenhoekiella
marinoflava

Legionella
anisa - erythra - feeleii - longbeachae - pneumophila - rubrilucens

Leifsonia
aquatica - aurea - naganoensis - poae - rubra - shinshuensis - xyli

Leisingera
methylohalidivorans

Leminorella
grimontii - richardii

Lentibacillus
lacisalsi - salarius - salicampi

Lentzea
albida - albidocapillata - californiensis - flaviverrucosa - violacea - waywayandensis

Leptospirillum
ferriphilum - ferrooxidans - sp.

Leptothrix
mobilis

Leptotrichia
amnionii - buccalis

Leucobacter
albus - alluvii - aridicollis - chromiireducens - komagatae - luti

Leuconostoc
argentinum - carnosum - citreum - fallax - ficulneum - fructosum - gasicomitatum - gelidum - inhae - lactis - mesenteroides - pseudoficulneum - pseudomesenteroides - sp.

Leucothrix
mucor

Limnobacter
thiooxidans

Listeria
grayi - innocua - ivanovii - monocytogenes - seeligeri - welshimeri

Listonella
anguillarum

Loktanella
fryxellensis - salsilacus - vestfoldensis

Lonepinella
koalarum

Longispora
albida

Luteibacter
rhizovicinus

Luteimonas
mephitis

Luteococcus
japonicus - peritonei - sanguinis

Lysobacter
antibioticus - brunescens - concretionis - daejeonensis - enzymogenes - gummosus - sp. - yangpyeongensis