This list of the prehistoric life of Connecticut contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Connecticut.

The Paleobiology Database records no known occurrences of Precambrian or Paleozoic fossils in Connecticut.

• †Acanthichnus
  • †Acanthichnus cursorius
• †Anchisauripus
  • †Anchisauripus exsertus
  • †Anchisauripus giganteus – type locality for species
  • †Anchisauripus hitchcocki
  • †Anchisauripus parallelus
  • †Anchisauripus sillimani
  • †Anchisauripus tuberosus

• 

  †Anchisaurus
  • †Anchisaurus polyzelus – type locality for species
• †Ancyropus – type locality for genus
  • †Ancyropus heteroclitus – type locality for species
• †Anomoepus
  • †Anomoepus curvatus
  • †Anomoepus gracillimus
  • †Anomoepus intermedius
• †Argoides
  • †Argoides macrodactylus – type locality for species
  • †Argoides minimus – type locality for species
• †Baiera
• †Batrachopus
  • †Batrachopus barrattii
  • †Batrachopus deweyi
  • †Batrachopus dispar
  • †Batrachopus gracilis
• †Belodon
  • †Belodon validus – type locality for species
• †Bisulcus
• Botryopera
• †Brontozoum
  • †Brontozoum divaricatum
  • †Brontozoum giganteum
  • †Brontozoum isodactylum
  • †Brontozoum sillimanium
• †Cochlichnus
• †Coelophysis
• †Conopsoides
  • †Conopsoides larvalis
• †Corvipes
  • †Corvipes lacertoideus
• †Cunichoides
  • †Cunichoides marsupialoideus – type locality for species
• †Cunicularius
  • †Cunicularius retrahens
• †Erpetosuchus

• 

  †Eubrontes
  • †Eubrontes approximatus
  • †Eubrontes dananus – type locality for species
  • †Eubrontes divaricatus
  • †Eubrontes giganteus
• †Gigandipus
  • †Gigandipus caudatus
• †Grallator
  • †Grallator cuneatus
  • †Grallator cursorius
  • †Grallator formosus
  • †Grallator magnificus
  • †Grallator tenuis
• †Harpedactylus
  • †Harpedactylus tenuissimus – type locality for species
• †Herpystezoum
  • †Herpystezoum minutus
• †Holcoptera
  • †Holcoptera giebeli
• †Hoplichnus
  • †Hoplichnus equus

• 

  †Hypsognathus
  • †Hypsognathus fenneri
• †Isocampe
  • †Isocampe strata
• †Loperia
• †Mormolucoides
  • †Mormolucoides articulatus
• †Ornithoidichnites
  • †Ornithoidichnites gracillior – type locality for species
  • †Ornithoidichnites sillimani – type locality for species

• 

  †Otozoum
  • †Otozoum moodii
• †Palamopus
  • †Palamopus divaricans
• †Platypterna
  • †Platypterna deanii – type locality for species
  • †Platypterna delicatula – type locality for species
  • †Platypterna tenuis – type locality for species
• †Plectropterna
  • †Plectropterna gracilis
  • †Plectropterna lineans
  • †Plectropterna minitans
• †Plectropus
  • †Plectropus longipes
• †Plesiornis
• †Redfieldius
  • †Redfieldius gracilis

• 

  †Semionotus
  • †Semionotus agassizi
  • †Semionotus tenuiceps
• †Sillimanius
  • †Sillimanius gracilior – type locality for species
  • †Sillimanius tetradactylus – type locality for species
• †Stegomus – type locality for genus
  • †Stegomus arcuatus – type locality for species
• †Steropoides
  • †Steropoides divaricatus
  • †Steropoides diversus
  • †Steropoides infelix
  • †Steropoides loripes
• †Tarsoplectrus
  • †Tarsoplectrus elegans – type locality for species
• †Triaenopus
  • †Triaenopus baileyanus – type locality for species
  • †Triaenopus lulli – type locality for species
• †Trihamus
  • †Trihamus elegans
  • †Trihamus magnus
• †Typopus
  • †Typopus gracilis – type locality for species

The Paleobiology Database records no known occurrences of Cenozoic fossils in Connecticut.

• Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.