Hyundai Rotem (Korean: 현대로템) is a South Korean company that manufactures rolling stock, defense products and plant equipment. It is a part of the Hyundai Motor Group. Its name was changed from Rotem to Hyundai Rotem in December 2007 to reflect the parent company. It is also called Hyundai Railroad Technology Systems.
 The company was founded in 1977. In 1999, the company changed its name to Korea Rolling Stock Corporation (KOROS) as a result of the merging between three major rolling stock divisions: Hanjin Heavy Industries, Daewoo Heavy Industries and Hyundai Precision & Industries. The company subsequently changed its name to Railroad Technology System, or Rotem, on 1 January 2002. It adopted its current name in December 2007 to reflect its current owner.
 Hyundai Rotem currently employs 3,800 people and exports to 50 countries worldwide.
 Notable projects include supplying most of South Korea's rolling stock, which include Korail's KTX high speed trains, electric multiple units (EMUs), and electric locomotives. Other products in South Korea include supplying all of Seoul Metro, Seoul Metropolitan Rapid Transit, Busan Metro Lines, and Shinbundang Line's rolling stock. International products include Hong Kong MTR's K-Stock and R-Stock EMUs, commuter EMUs for Taiwan, trains for the New Delhi Metro, and automated trains for the Canada Line in Vancouver, Canada. It delivered 120 Silverliner V commuter trains for SEPTA Regional Rail in the Philadelphia, Pennsylvania area and 66 Silverliner Vs for Regional Transportation District (RTD)'s A Line.
 Hyderabad Metro Rail announced on September 12, 2012, that it has awarded the rolling stock tender to Hyundai Rotem of South Korea. The tender is for 57 rakes consisting of 171 cars which will delivered phase wise at least 9 months before the commencement of each stage. On 22 May 2014 the first train had arrived at Uppal depot in Hyderabad.
On 31 December 2014, Hyderabad Metro created a new technology record by successfully running a train in Automatic Train Operation (ATO) mode for the first time on Indian soil between Nagole and Mettuguda.
 Hyundai Rotem announced on November 11, 2008, that it had signed a €580m contract to supply the rolling stock for the Marmaray cross-Bosporus tunnel project in Istanbul. The Korean firm saw off competition from short-listed bidders Alstom, CAF and a consortium of Bombardier, Siemens and Nurol for the 440-vehicle contract which was placed by the Ministry of Transport's General Directorate of Railways, Harbours & Airports.
 The 22 m long stainless steel cars will be formed into 10 and five-car EMUs. Some production will be carried out locally by Eurotem, Hyundai Rotem's joint venture with Turkish rolling stock manufacturer TÜVASAŞ. The cars will arrive in three batches, the first 160 cars by 2011, the last by June 2014.
 Hyundai Rotem won its first contract in Turkey in 1996, and has now completed seven orders for a total of 804 vehicles worth US$1·6bn. In July it signed a contract to provide 84 DMUs in conjunction with Tüvasas.
 'Hyundai Rotem has earned the trust of Turkey by providing high quality products and technology', said Executive Vice-chairman Yeo-Sung Lee. 'We believe this brightens the outlook for future business opportunities in Turkey such as the Istanbul line and the Ankara line.'
 Hyundai Rotem was awarded a contract with Boston's MBTA in early 2008 for the construction of 75 cars. The contract entails the delivery of the first 4 cars by October 2010 while the remaining 71 cars were scheduled to be delivered by the end of 2012. However, due to chronic delays, shoddy workmanship, material shortage, and the death of Hyundai Rotem's chief executive, M.H. Lee, in November 2012, only four cars have been delivered by the end of 2012. On December 21, 2012, the MBTA sent a letter to Hyundai Rotem threatening to cancel the contract if a solution is not soon reached, which, would be a breach of the contract terms. Since then, the new cars have continued to experience various mechanical problems resulting in car shortages and delays.