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Labocania was a theropod dinosaur from the late Cretaceous era, approximately 83 to 73 million years ago.

Labyrinthodonts be the first amphibians.

Lagosuchus was a dinosaur-like reptile that was a forebear of the dinosaurs that lived during the middle Triassic era, about 230 million years ago.

Lambeosaurus was a duck-billed dinosaur with a large crest from the late Cretaceous era.

Laosaurus is a doubtful genus of dinosaur specifically only known from fragmentary fossils.

Laplatasaurus was a big, slender, armored sauropod dinosaur from the late Cretaceous era, approximately 83 to 65 million years ago.

Lariosaurus a primal aquatic reptile of the Triassic period.

Laurasia Northern supercontinent of the Jurassic.

Lava molten rock which reaches the Earth's surface during erupting volcanoes.

Leaellyhnosaura it is the single dinosaur ever to be named after a little girl.

Leptauchenia was a big, rare, herbivorous mammal that browsed grasslands and woodlands.

Leptoceratops it is one of the most ancient of all ceratopsians.

Leptopterygius it is also known as Temnodontosaurus and it was a late Ichthyosaur, an extinct marine reptile, not a dinosaur.

Lesothosaurus it was a very early ornithopod, a small, fast, bipedal, plant eating dinosaur. It lived throughout the early Jurassic period.

Lewisuchus was a small, energetic genus of archosauromorphs

Lexovisaurus it was a plant-eating, stegosaurid dinosaur that was about 17 feet (5 m) long and weighed about 2000 kg.

Libellulium was a big, olden dragonfly that lived during the Jurassic period, approximately 150 million years ago.

Liliensternus it is  one of the largest carnivores of the Triassic period.

Liopleurodon with Cryptoclidus, one of the largest of all marine reptiles.

Living Fossil an organism that lived throughout ancient times and still live today, moderately unchanged, like the horseshoe crab.

Losillasaurus was a enormous, plant-eating dinosaur with a long neck, long, whip-like tail, small head, and large body.

Lourinhasaurus it was a quadrupedal, plant-eating dinosaur that lived throughout the late Jurassic period

Lufengosaurus it was a plateosaurid prosauropod, a long-necked, small-headed, quadrupedal, herbivorous dinosaur with extensively spaced teeth.

Lurdusaurus this ornithopod resembled a huge idleness.

Lycorhinus was a heterodontosaurid dinosaur recognized only from a lower jaw bone with very long and sharp canine teeth

Lystrosaurus this pig-like reptile preceded the dinosaurs.