The BR85 Heavy Barrel Service Rifle, known more commonly as the Battle Rifle, is a infantry rifle used by the UNSC. It fires three-round bursts out of a 36 round magazine, and is extremely effective against energy shielding. It is one of the most well-known weapons in the UNSC.

The BR85 is a newer iteration of the BR55 and BR55HB battle rifles, which were in service earlier, during the Human-Covenant War, and features various design improvements over those weapons. These include a lighter frame and rail mounts for weapon attachments, among other things.

The BR85 was first introduced in Halo 4, released in 2012, and will return in the upcoming game Halo 5 in October 2015.