| 3rd Army | |
|---|---|
| 제3야전군 | |
 | |
| Active | 1 July 1973 – 31 December 2018 |
| Country |  South Korea |
| Branch |  Republic of Korea Army |
| Type | Field Army |
| Garrison/HQ | Yongin, Gyeonggi Province [1] |
| Nickname(s) | Vanguard |
| Commanders | |
| Notable commanders | Baek Gun-gi [2] |
The 3rd Army was a field army of the South Korean Army.
The 3rd Army was formed on 1 July 1973. The purpose of the 3rd Army was to defend the metropolitan areas of the Gyeonggi Province as well as the western frontline area. [3] In 2015, it was announced that 1st Army would be merged with the 3rd Army in order to form the Republic of Korea Army Ground Operations Command. [4] The 1st and 3rd Armies were disbanded on 31 December 2018 while the Republic of Korea Army Ground Operations Command was formed a day later on 1 January 2019. [5] [6] On 15 January 2025, 3rd Field Army Military Police Commander Colonel Kim Yong-gun was arrested for allegedly planning the 2024 South Korean martial law crisis with former intelligence commander Roh Sang-won. [7] On 27 February 2025, the 25th Criminal Division of the Seoul Central District Court accused former ROK Army Intelligence Commander Noh Sang-won of planning the 2024 South Korean martial law crisis with the aid of Kim Yong-gun. [8]