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This list of the Mesozoic life of Maryland contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Maryland and are between 252.17 and 66 million years of age.

A

Acirsa
- †Acirsa americana – or unidentified related form
- †Acirsa clathrata
- †Acirsa flexicostata
Life restoration of the Early Cretaceous theropod dinosaur Acrocanthosaurus
†Acrocanthosaurus – or unidentified comparable form
†Acteon
- †Acteon cicatricosus
†Acutostrea
- †Acutostrea plumosa
†Aenona
- †Aenona eufaulensis
- †Aenona georgiana
†Agerostrea
- †Agerostrea mesenterica
Fossilized skeleton of the Late Cretaceous-Oligocene Alligator relative Allognathosuchus
†Allognathosuchus – or unidentified comparable form
†Allosaurus
- †Allosaurus medius – type locality for species
†Ambigostrea
- †Ambigostrea tecticosta
Amuletum
- †Amuletum dumasensis
- †Amuletum fasciolatum – or unidentified comparable form
Assemblage of fossilized skeletons of the softshell turtle Amyda
†Amyda
- †Amyda prisca
†Anatimya
- †Anatimya anteradiata
†Ancilla
- †Ancilla acutula
†Anomalofusus
- †Anomalofusus lemniscatus
†Anomia
- †Anomia argentaria
- †Anomia ornata
†Anomoeodus
- †Anomoeodus latidens
- †Anomoeodus phaseolus
†Anteglossia
†Aphrodina
- †Aphrodina tippana
†Araloselachus
- †Araloselachus cuspidata
†Arctostrea
- †Arctostrea falacata
†Argillomys – type locality for genus
- †Argillomys marylandensis – type locality for species
†Ariadnaesporites
- †Ariadnaesporites intermedius – type locality for species
Arrhoges
†Arundelconodon – type locality for genus
- †Arundelconodon hottoni – type locality for species
†Arundelemys – type locality for genus
- †Arundelemys dardeni – type locality for species
Astarte
- †Astarte culebrensis
Life restoration of the Early Cretaceous sauropod dinosaur Astrodon
†Astrodon
- †Astrodon johnstoni – type locality for species

B

Fossilized shell of the Late Cretaceous ammonoid cephalopod Baculites
†Baculites
- †Baculites baculus
- †Baculites elisasi
- †Baculites vertebralis
†Bathytormus
- †Bathytormus pteropsis
†Bellifusus
- †Bellifusus curvicostatus
†Belliscala
†Beretra
- †Beretra gracilis – or unidentified comparable form
- †Beretra ripleyana
- †Beretra speciosa
†Bottosaurus
- †Bottosaurus harlani
Botula
- †Botula conchafodentis
- †Botula lingua
- †Botula ripleyana
†Buccinopsis
- †Buccinopsis crassicostata

C

Cadulus
- †Cadulus obnutus
Caestocorbula
- †Caestocorbula crassaplica
- †Caestocorbula crassiplica
- †Caestocorbula percompressa
- †Caestocorbula terramaria
†Camptonectes
- †Camptonectes bubonis
Carcharias
- †Carcharias holmdelensis
- †Carcharias samhammeri
†Cardiaster
- †Cardiaster marylandicus
Cardium [fr; nl; sv]
†Caveola
- †Caveola acuta
Life restoration of the Late Triassic-Eocene lungfish Ceratodus
†Ceratodus
- †Ceratodus kranzi – type locality for species
Cerithium
- †Cerithium weeksi – or unidentified related form
Chiloscyllium
- †Chiloscyllium greeni
†Cimoliasaurus
- †Cimoliasaurus magnus
†Clavatipollenites
†Clavipholas
- †Clavipholas pectorosa
- †Clavipholas pectrosa
†Coelosaurus
- †Coelosaurus affinis
- Illustration of a fossilized tibia of the Late Cretaceous theropod dinosaur Coelosaurus antiquus
  †Coelosaurus antiquus
†Coelurus
- †Coelurus gracilis – type locality for species
†Corax
- †Corax pristiodontus
Corbula
- †Corbula subradiata
†Corymya – or unidentified comparable form
- †Corymya tennis
†Couperites
- †Couperites mauldinensis
Crassatella
- †Crassatella vadosa
†Crenella
- †Crenella elegantula
- †Crenella serica
†Creonella
- †Creonella subangulata – or unidentified comparable form
- †Creonella triplicata
Fossil of the Early Cretaceous-Eocene shark Cretolamna
†Cretolamna
- †Cretolamna appendiculata
- †Cretolamna serrata – or unidentified comparable form
Cucullaea
- †Cucullaea capax
†Cuna
- †Cuna texana
†Cuneolus
- †Cuneolus pectrosa
- †Cuneolus tippana
Cuspidaria
- †Cuspidaria ampulla
†Cyclorisma
- †Cyclorisma parva
Cylichna
- †Cylichna diversilirata
- †Cylichna incisa
†Cylindracanthus
†Cymbophora
- †Cymbophora appressa
- †Cymbophora berryi
- †Cymbophora wordeni
†Cymella
- †Cymella bella
†Cyprimeria
- †Cyprimeria alta
- †Cyprimeria depressa
- †Cyprimeria major

D

Dasyatis
Life restoration of the Early Cretaceous dromaeosaur ("raptor") Deinonychus
†Deinonychus
- †Deinonychus antirrhopus
†Deinosuchus
- †Deinosuchus rugosus
†Dentalium
- †Dentalium leve
†Deussenia
- †Deussenia bellalirata
- †Deussenia ripleyana
†Discoscaphites
- †Discoscaphites abyssinius
- †Discoscaphites conradi
- †Discoscaphites gulosus
- †Discoscaphites iris
†Drilluta
- †Drilluta buboanus
- †Drilluta distans
- †Drilluta marylandicus

E

†Egertonia
†Ellipsoscapha
- †Ellipsoscapha cylindrica
- †Ellipsoscapha mortoni
- †Ellipsoscapha occidentalis – or unidentified comparable form
Restoration of the Early Cretaceous-Eocene bony fish Enchodus, or the "saber-toothed herring"
†Enchodus
- †Enchodus dirus
- †Enchodus ferox
- †Enchodus feroz
†Endoptygma
- †Endoptygma leprosa
†Eoacteon
- †Eoacteon linteus
†Etea
- †Etea carolinensis
†Eubaculites
- †Eubaculites carinatus
- †Eubaculites latecarinatus
†Eufistulana
†Eufistulina
†Eulima
- †Eulima clara
- †Eulima monmouthensis
†Euspira
- †Euspira rectilabrum
- †Euspira reetilabrum
†Eutrephoceras
- †Eutrephoceras dekayi
†Ewingia
- †Ewingia problematica
Interior of a fossilized shell of the Jurassic-Cretaceous foam oyster Exogyra
†Exogyra
- †Exogyra costata

F

†Flabellosmilia
- †Flabellosmilia vaughani
†Fulgerca
- †Fulgerca attenuata – or unidentified related form
†Fusimilis
- †Fusimilis kummeli
- †Fusimilis novemcostatus
- †Fusimilis tippanus

G

Galeorhinus
- †Galeorhinus giradoti
Ginglymostoma
Glossus
Glycimeris
- †Glycimeris mortoni
Glycymeris
- †Glycymeris rotundata
†Glyptops
- †Glyptops caelatus – type locality for species
†Goniochasma
†Goniopholis
- †Goniopholis affinis – type locality for species
Fossil negative with skin impressions of the theropod dinosaur footprint ichnogenus Grallator
†Grallator – or unidentified comparable form
†Granocardium
- †Granocardium dumosum
- †Granocardium eufalense
- †Granocardium kuemmeli
- †Granocardium kummeli
- †Granocardium lowei
†Graphidula
- †Graphidula multicostata
- †Graphidula terebriformis
†Gryphaeostrea
- †Gryphaeostrea vomer
Gyrodes
- †Gyrodes americanus
- †Gyrodes spillmani
- †Gyrodes subcarinatus
- †Gyrodes supraplicatus

H

†Hadrodus
Life restoration of the Late Cretaceous mosasaur Halisaurus
†Halisaurus
- †Halisaurus platyspondylus
†Hamatia – type locality for genus
- †Hamatia elkneckensis – type locality for species
†Hamulus
- †Hamulus falcatus
- †Hamulus huntensis – tentative report
- †Hamulus onyx
- †Hamulus squamosus
†Hercorhynchus
- †Hercorhynchus trililatus
†Hercorhyncus
- †Hercorhyncus pagodaformis
- †Hercorhyncus tippanus
Heterodontus
†Heteromorpha
- †Heteromorpha ammonite
Fossil of the Jurassic-Paleogene lobster Hoploparia
†Hoploparia
- †Hoploparia gladiator
†Hybodus
†Hydrotribulus
- †Hydrotribulus asper
†Hyposaurus
- †Hyposaurus rogersii
†Hypotodus
†Hypsiloichnus – type locality for genus
- †Hypsiloichnus marylandicus – type locality for species

I

Fossilized shell of the Early Jurassic-Late Cretaceous marine bivalve Inoceramus with a human indicating its size
†Inoceramus
†Ischyodus
†Ischyrhiza
- †Ischyrhiza avonicola – or unidentified comparable form
- †Ischyrhiza mira