Bagrat I the Minor (, Bagrat Mts'ire; died 1372), of the Bagrationi dynasty, was king of Western Georgia from 1329 until 1330, when he was reduced to a vassal duke by George V of Georgia.
Bagrat was the only known son of King Michael of Imereti, on whose death he succeeded in 1329. Still a minor at this time (hence, his moniker mts'ire), Bagrat was compelled to remain in his capital, Kutaisi, as the provinces were being divided by the rivaling noble factions. In 1330, George V of Georgia took advantage of the situation and of being Bagrat's relative and crossed the Likhi Range into Imereti, being welcomed by many Imeretians, weary of persistent violence and anarchy. Imereti was conquered and the integrity of the Kingdom of Georgia restored. Henceforth, Bagrat sat as eristavi ("duke") in Imereti, with his seat in Shorapani, under the tutelage of George V.
In 1358, Bagrat married, with the approval of King David IX, a daughter of Qvarqvare I Jaqeli, Atabeg of Samtskhe. They had three sons: