The United States Eventing Association (USEA) is the organization responsible for organizing, promoting and adjudicating equestrian eventing in the United States. Formerly known as the United States Combined Training Association, the USEA is a 501(c)(3) non-profit organization.

The association has approximately 13,000 members and organizes around 250 competitions annually, which garner almost 44,000 entries. The USEA works in association with the United States Equestrian Team Foundation and United States Equestrian Federation.

The USEA was founded as the United States Combined Training Association in 1959, as the governing body for the sport of combined training, more commonly known as eventing, in the United States of America. In 2001 the organization's name was changed to the United States Eventing Association. It was formed to promote the sport of eventing throughout the country, from the beginner novice to the advanced level. It set rules to protect the safety of the competitors, both human and equine, and those requiring the humane treatment of the horses. The USEA is also responsible for organizing clinics and educational opportunities, registering events that met their qualifications, and assisting in training opportunities for the best competitors in the country.

The USEA is broken down into 10 different regions called Areas. Each Area has its own governing body that is elected by the registered rides and constituents of the area. These governing bodies help to set the show schedules, run the local Adult and Young Rider Programs, and host annual meetings.

Area I • Connecticut, Maine, Massachusetts, New Hampshire, New York, Rhode Island, and Vermont

Area II • New Jersey, Pennsylvania, Maryland, Delaware, Virginia, and North Carolina

Area III • Tennessee, South Carolina, Mississippi, Alabama, Georgia, and Florida

Area IV • Illinois, Iowa, Kansas, Missouri, Minnesota, Nebraska, North Dakota, and Wisconsin