Serbian Railways (Serbian: Железнице Србије / Železnice Srbije; abbr. ЖС / ŽS) is a Serbian engineering and technical consulting company based in Belgrade, Serbia. In 2015, the Government of Serbia established three new companies which took over Serbian Railways' former jurisdictions: Srbijavoz (passenger transport), Srbija Kargo (cargo transport) and Serbian Railways Infrastructure (infrastructure management). These companies are not part of the company Serbian Railways.

Since then, Serbian Railways continued with modified business activity: engineering and technical consulting, consulting activities in the field of information technology and other information technology services, buying and selling real estate, rental and management activities, accounting, bookkeeping and auditing activities, tax advisory services, technical testing and analysis, rental and leasing of other machinery, equipment of non-material goods, activities of the museums, galleries and collections.

Serbia is a member of the International Union of Railways (UIC). The UIC Country Code for Serbia is 72.

The history of rail transport in Serbia began in the mid-19th century when most of the territory was still held by the Austro-Hungarian and Ottoman Empires. The first rail line on the present-day territory of Serbia was inaugurated on 20 August 1854, between Lisava-Oravica-Bazijaš and the train operated on horse-drawn traffic which was replaced in 1856 by steam locomotives. Part of the line is located in Serbia, passing through Bela Crkva while the rest is in Romania. All subsequently built lines were laid towards Budapest as the territory was still part of the Austro-Hungarian Empire back then. On the territory which was under the Ottomans, the line Skopje-Kosovska Mitrovica was inaugurated in 1874. However, the major expansion began after the Berlin Congress and the independence of the, theretofore vassal to the Ottomans, Principality of Serbia during the second half of the 19th century.

Serbian Railways as a company is traced back to 1881 when Prince Milan I declared formation of the Serbian National Railways. The first train departed from Belgrade to Niš on 23 August 1884, which is considered by Serbian Railways as the official year when the company was created.^{[citation needed]}

This was not the first operational railway on the territory of then-Kingdom of Serbia, though, as the one in opened in 1882, a primarily industrial, though occasionally used for passenger transport, 12 km (7.5 mi) long 600 mm (1 ft 11+5⁄8 in) wide gauge track from Majdanpek copper processing plant to Velike Livade (a former village taken over by the plant) and constructed by the Serbian Copper & Iron Co. (official name in English, most stockholders were British) had its first run on the track in June 1882.

Another one in Eastern Serbia followed suit in 1888, the 80 km (50 mi) long dual purpose (industrial and passenger transport) 760 mm (2 ft 5+15⁄16 in) track from Vrška Čuka mine to the port of Radujevac on the Danube, built by the Societé Anonyme "L'Industrielle Serbe" registered at Brussels in Belgian, French, (Austro-)Hungarian, and Serbian ownership (in order of the percentage of stock owned).

From the 1920s until the 1990s, it operated under the name Yugoslav Railways, responsible for railways in the Socialist Federal Republic of Yugoslavia. The first electrified line was opened between Belgrade and Šid in 1970. The line connecting Serbia with south Adriatic (Belgrade-Bar) was opened in 1976.