The 3rd Guards Lugansk-Severodonetsk Combined Arms Army (Russian: 3-я гвардейская Луганско-Северодонецкая общевойсковая армия) is a military formation in the Russian Ground Forces as part of the Southern Military District.

Formerly the 2nd Army Corps of the Luhansk People's Republic,[2] it was officially incorporated into the Russian Federation on 31 December 2022, after the Russian annexation of the Luhansk Oblast,[3] and then reformed into a Combined Arms Army in 2024.

[4] The 2nd Army Corps was formed on 7 October 2014 as an effort to unite numerous volunteer units under one command.

Considered by Ukrainian and Western analysts as a formal part of the Russian 8th Combined Arms Army, it nevertheless had a certain degree of autonomy.

The Corps was deployed along the contact line that stretched from the Russian border to the DPR border north of Debaltseve, where it met with the 1st Army Corps.