The Gyeongdong Line (慶東線, Keitō-sen) was a 762 mm (2 ft 6.0 in) narrow gauge railway line of the Chōsen Railway (Chōtetsu) of colonial-era Korea, in North Gyeongsang Province.

[1] In January 1916, the privately owned Chōsen Light Railway began work on a new rail line from Daegu on the Chōsen Government Railway's Gyeongbu Line towards Pohang.

The first section, 23.0 km (14.3 mi) from Daegu to Hayang, was opened on 1 November 1917.

Five months later, on 25 June 1919, a 2.0 km (1.2 mi) extension of the main line from Pohang to Haksan was opened, and on 27 September of the same year, the Chōsen Light Railway was renamed Chōsen Central Railway Co. Ltd.

[3] Initially, only mixed trains, with both passenger and freight cars, operated on the line; in 1922, there was one daily round trip between Daegu and Yeongcheon, four daily round trips between Yeongcheon and Pohang, four between Pohang and Haksan, eight between Seoak and Gyeongju, and three between Gyeongju and Ulsan.