Paleontology or palaeontology is the study of prehistoric life forms on Earth through the examination of plant and animal fossils.^[1] This includes the study of body fossils, tracks (ichnites), burrows, cast-off parts, fossilised feces (coprolites), palynomorphs and chemical residues. Because humans have encountered fossils for millennia, paleontology has a long history both before and after becoming formalized as a science. This article records significant discoveries and events related to paleontology that occurred or were published in the year 1825.

Data courtesy of George Olshevsky's dinosaur genera list.^[2]

Name	Novelty	Status	Author(s)	Age	Unit	Location	Notes	Images
Iguanodon[3]	Gen. nov.	Valid	Gideon Algernon Mantell	Barremian, 126–125 mya	Wessex Formation, Bernissart, Calizas de La Huergina Formation, Arcillas de Morella Formation	England,  Belgium,  Spain,  France,	In a presentation to the Royal Society of London, Mantell reports his conclusion that the newly named Iguanodon is a new giant herbivorous reptile.[4]

Name	Novelty	Status	Authors	Age	Unit	Location	Notes	Images
Larus toliapicus[5]	Sp. nov	Valid	Koenig	Early Eocene (Ypresian)	London Clay Formation	England	Described as a genus of Laridae, but transferred to a new genus Halcyornis Owen, 1846, and placed in the new family Halcyornithidae Harrison et Walker, 1972, This family was placed in synonymy with the family Pseudasturidae Mayr, 1998, by Mayr, 2009, stem Psittaciformes. This is the type species of the genus Halcyornis.