The equestrian program at the 1912 Summer Olympics in Stockholm, included five medal events. There were individual competitions in dressage, eventing, and show jumping. Team scores were also gathered and medals awarded for teams in the eventing and jumping competitions. Equestrian had been absent from the Olympic program since the 1900 Summer Olympics, making the 1912 Games the second time the sport was featured. Ten nations competed: Belgium, Chile, Denmark, France, Germany, Great Britain, Norway, Russia, Sweden, and the USA. Only Sweden and Germany were able to supply a full team for all three disciplines, with several countries having several riders and horses used in two or even all three disciplines. A total of 88 entries ran in the three events, with 62 riders and 70 horses.

Eventing is an equestrian event where a single horse and rider combine and compete against other competitors across the three disciplines of dressage, cross-country, and show jumping. This event has its roots in a comprehensive cavalry test that required mastery of several types of riding. The competition may be run as a one-day event (ODE), where all three events are completed in one day or a three-day event (3DE), which is more commonly now run over four days, with dressage on the first two days, followed by cross-country the next day and then show jumping in reverse order on the final day. Eventing was previously known as Combined Training, and the name persists in many smaller organizations. The term "Combined Training" is sometimes confused with the term "Combined Test", which refers to a combination of just two of the phases, most commonly dressage and show jumping.