The Busan Metro (Korean: 부산 도시철도) is the urban rail system operated by the Busan Transportation Corporation of Busan, South Korea. The metro network first opened in 1985 with seventeen stations, making Busan the second city in South Korea and third in the Korean Peninsula (after Seoul and Pyongyang) to have a metro system. The Metro itself consists of 4 numbered lines, covering 116.5 kilometres (72.4 mi) of route and serving 114 stations. Including the BGL and the Donghae Line, the network covers 205.6 kilometres (127.8 mi) of route and serving 158 stations.

All directional signs on the Busan Metro are written in both Korean and English, and the voice announcement in the trains indicating the upcoming station, possible line transfer and exiting side are all spoken in Korean, followed by English. Station transfer announcements are first in Korean, followed by in English, then in Mandarin, and finally in Japanese. Announcements at stations for arriving trains are in Korean, followed by English, then Japanese and Mandarin. All stations are numbered and the first numeral of the number is the same as the line number, e.g. station 123 is on line 1.

The Metro map includes information on which station, and which numbered exit from that station, to use for main attractions. Photography in the Busan Metro is permitted.

Busan Metro Line 1 (1호선) is the north-south route. It is 39.8-kilometre (24.7 mi) long with 40 stations. The line uses trains that have eight cars each. The total construction cost was 975.1 billion won.

Plans for this line were made in 1979. Two years later, in 1981, construction began on the first phase, between Nopo-Dong (now Nopo) and Beomnaegol, which was finished in July 1985. This stretch was 16.2-kilometre (10.1 mi) long. Further extensions continued southward: a 5.4-kilometre (3.4 mi) extension from Beomnaegol to Jungang-dong (now Jungang) opened in May 1987; a 4.5-kilometre (2.8 mi) extension to Seodaeshin-dong (now Seodaeshin) opened in February 1990; and a 6.4-kilometre (4.0 mi) extension to Shinpyeong opened in June 1994.

The extension of the line further into Saha District from Shinpyeong to Dadaepo Beach 7.3-kilometre (4.5 mi) was finished in mid-April 2017.

Busan Metro Line 2 (2호선) crosses Busan from east to west, running along the shores of Haeundae and Gwangalli, and then north toward Yangsan. It is 46.0-kilometre (28.6 mi) long, serving 43 stations. The line uses trains that have six cars each.

Construction on the Phase 1 began in 1991. But this 21.7-kilometre (13.5 mi) route, serving 21 stations between Hopo and Seomyeon, did not open until 30 June 1999. With Phase 2 (planned to be 16.3 kilometres (10.1 mi) in total), the line was first extended 7.7 kilometres (4.8 mi) southeast from Seomyeon to Geumnyeonsan on 8 August 2001. The remainder of Phase 2 was implemented in two stages: Line 2 was extended 1.8 km (1.1 mi) north to Gwangan on January 16, 2002, and finally on 29 August 2002 it was extended 6.8 kilometres (4.2 mi) east to Jangsan.