Horqin Left Rear Banner (Mongolian: ; , original Mongolian name Büve vang qosigu) is a banner of southeastern Inner Mongolia, China, bordering Liaoning province to the south. It is under the administration of Tongliao City, to the north and its banner seat is the town of Ganjig. The local Mongolian dialect is Khorchin Mongolian.
Horqin Left Rear Banner is made up of 10 towns, 1 township and 5 sums.