Labrys
methylaminiphilus - monachus

Laceyella
putida - sacchari

Lachnobacterium
bovis

Lachnospira
multipara

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

Lactococcus
garvieae - lactis - piscium - plantarum - raffinolactis - sp.

Lactonifactor
longoviformis

Lactosphaera
pasteurii

Lamprocystis
roseopersicina

Lampropedia
hyalina

Laribacter
hongkongensis

Larkinella
insperata

Lautropia
mirabilis

Leadbetterella
byssophila

Lebetimonas
acidiphila

Lechevalieria
aerocolonigenes - flava

Leclercia
adecarboxylata

Leeuwenhoekiella
aequorea - marinoflava

Legionella
adelaidensis - anisa - beliardensis - birminghamensis - brunensis - cherrii - cincinnatiensis - erythra - fairfieldensis - feeleii - geestiana - genomospecies - gratiana - gresilensis - hackeliae - israelensis - jamestowniensis - jordanis - lansingensis - londiniensis - longbeachae - moravica - nautarum - oakridgensis - parisiensis - pneumophila - quateirensis - quinlivanii - rubrilucens - sainthelensi - santicrucis - shakespearei - spiritensis - steigerwaltii - taurinensis - tucsonensis - wadsworthii - waltersii - worsleiensis

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

Leisingera
methylohalidivorans

Leminorella
grimontii - richardii

Lentibacillus
lacisalsi - salarius - salicampi

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

Leptospira
interrogans

Leptospirillum
ferriphilum - ferrooxidans - sp.

Leptothrix
cholodnii - mobilis - sp.

Leptotrichia
amnionii - buccalis

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

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

Leucothrix
mucor

Lewinella
cohaerens - nigricans - persicus

Limnobacter
thiooxidans

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

Listonella
anguillara - anguillarum - pelagia

Loktanella
fryxellensis - rosea - salsilacus - vestfoldensis

Lonepinella
koalarum

Longispora
albida

Luteibacter
rhizovicinus

Luteimonas
mephitis

Luteococcus
japonicus - peritonei - sanguinis

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