Horqin Left Middle Banner (Mongolian: ; ), formerly known as Darhan Banner (), is a banner of eastern Inner Mongolia, China, bordering Jilin province to the east. It is under the administration of Tongliao City, to the southwest. The local Mongolian dialect is Khorchin Mongolian.
Horqin Left Middle Banner is made up of 1 subdistrict, 11 towns, 1 township, 5 sums, and 3 farms and pastures.