Formation The brigade was formed on 27 June 2018 in
Ternopil Oblast. On 2 August in
Borshchiv, over 200 reservists were gathered for training. In November a recruitment drive was organized to fill the brigade's ranks. and March 2019 the brigade held readiness exercises.
Russo-Ukrainian War Russian invasion of Ukraine On 4 March,
Ternopil Oblast governor
Volodymyr Trush announced that the brigade was at its full strength. Its soldiers were tasked with defense of critical infrastructure, manning roadblocks and helping postal workers deliver pensions. In early March 2022, the 105th Brigade was ordered to form a consolidated battalion to be deployed into combat operations. It was initially planned that one company would be sent from each of the brigade's 80th, 82nd, 83rd, and 85th Battalions. Units of the 105th Brigade's consolidated battalion began deploying by 11 March. Starting on 15 April, the brigade's 83rd Battalion held a defensive line from the western outskirts of Barvinkove to the villages of and , with its command post in the village of . In early October 2022, the 83rd Battalion was deployed to defend the village of
Masiutivka in the
Kharkiv Oblast, with its headquarters located in
Dvorichna. The battalion took up positions southeast of Masiutivka near a railway line. At the end of the month, the battalion was subordinated to the
14th Mechanized Brigade. Units of the brigade were stationed at the
Kupiansk direction in the Kharkiv Oblast between October 2022 and March–April 2023. The brigade's 83rd Battalion held the defense of the
Oskil River near the villages of
Masiutivka, , and between fall 2022 and 2025.{{cite web|first=Віталій|last=Іванченко|title=83 батальйон 105 окремої бригади ТрО ЗСУ – з першого дня війни на захисті України == Structure ==