What is the name for equipment or accessories equipped on horses?

Tack is equipment or accessories equipped on horses and other equines in the course of their use as domesticated animals. Saddles, stirrups, bridles, halters, reins, bits, harnesses, martingales, and breastplates are all forms of horse tack. Equipping a horse is often referred to as tacking up. A room to store such equipment, usually near or in a stable, is a tack room.

Saddles are seats for the rider, fastened to the horse's back by means of a girth (English-style riding), known as a cinch in the Western US, a wide strap that goes around the horse at a point about four inches behind the forelegs. Some western saddles will also have a second strap known as a flank or back cinch that fastens at the rear of the saddle and goes around the widest part of the horse's belly.

It is important that the saddle be comfortable for both the rider and the horse as an improperly fitting saddle may create pressure points on the horse's back muscle (Latissimus dorsi) and cause the horse pain and can lead to the horse, rider, or both getting injured.

There are many types of saddle, each specially designed for its given task. Saddles are usually divided into two major categories: "English saddles" and "Western saddles" according to the riding discipline they are used in. Other types of saddles, such as racing saddles, Australian saddles, sidesaddles and endurance saddles do not necessarily fit neatly in either category.