The northern crested newt, great crested newt or warty newt (Triturus cristatus) is a newt species native to Great Britain, northern and central continental Europe and parts of Western Siberia. It is a large newt, with females growing up to 16 cm (6.3 in) long. Its back and sides are dark brown, while the belly is yellow to orange with dark blotches. Males develop a conspicuous jagged crest on their back and tail during the breeding season.

The northern crested newt spends most of the year on land, mainly in forested areas in lowlands. It moves to aquatic breeding sites, mainly larger fish-free ponds, in spring. Males court females with a ritualised display and deposit a spermatophore on the ground, which the female then picks up with her cloaca. After fertilisation, a female lays around 200 eggs, folding them into water plants. The larvae develop over two to four months before metamorphosing into terrestrial juveniles (efts). Both larvae and land-dwelling newts mainly feed on different invertebrates.

Several of the northern crested newt's former subspecies are now recognised as separate species in the genus Triturus. Its closest relative is the Danube crested newt (T. dobrogicus). It sometimes forms hybrids with some of its relatives, including the marbled newt (T. marmoratus). Although today the most widespread Triturus species, the northern crested newt was probably confined to small refugial areas in the Carpathians during the Last Glacial Maximum.

While the International Union for Conservation of Nature lists it as Least Concern species, populations of the northern crested newt have been declining. The main threat is habitat destruction, for example, through urban sprawl. The species is listed as a European Protected Species.