Thorold's deer (Cervus albirostris) is a threatened species of deer found in grassland, shrubland and forest at high altitudes in the eastern Tibetan Plateau. It is also known as the white-lipped deer (Baichunlu, 白唇鹿, in Simplified Chinese, ཤྭ་བ་མཆུ་དཀར།་ in Standard Tibetan) for the white patches around its muzzle.

This deer fills an ecological niche similar to the Shou (the subspecies wallichi of the Red Deer species group). It was first scientifically described by Nikolai Przhevalsky in 1883, and the first specimens were procured by G. W. Thorold, after whom the species is named. As of early 2011, more than 100 Thorold's deer are kept in ISIS-registered zoos, and in 1998 it was estimated that about 7000 remain in the wild.

Although the species was first described by Nikolai Przhevalsky in 1883, it is known as "Thorold's deer" because the first specimens was procured by G. W. Thorold. The former genus however, is named after Przhevalsky (Przewalskium) and the species name (albirostris) come from the Latin words albus (white) and rostrum (snout), referring to the white muzzle and lips. The name also came from the Chinese word "Baichunlu" (白唇鹿, Simplified Chinese), meaning "white-lipped". For this reason Thorold's deer is also commonly known as the white-lipped deer.

Thorold (2011 population 17,931) is a city in Ontario, Canada, located on the Niagara Escarpment. It is also the seat of the Regional Municipality of Niagara.

The Welland Canal passes through the heart of the city, and the Twin Flight Locks, located downtown, attract thousands of tourists annually.

The earliest communities in what is now Thorold emerged at Beaverdams, DeCew Falls and St. Johns but, after the opening of the First Welland Canal in 1829, they were superseded by the new canal villages of Thorold, Allanburg and Port Robinson. Thorold, located on the brow of the Niagara Escarpment, soon became dominant and was incorporated as a village in 1850 and as a town in 1870. When the Regional Municipality of Niagara was formed in 1970, the Town of Thorold expanded to include the former Thorold Township. In 1975 the town became incorporated as the City of Thorold.

Thorold is also the location of the War of 1812 battle site, Beaverdams, where, on June 25, 1813, Colonel Charles Boerstler and his American troops were defeated by a force of 80 British regulars and 300 Caughnawaga Mohawks.