David John O'Connor (born January 18, 1962) is a retired equestrian who represented the United States in the sport of three-day eventing.

O'Connor has held top coaching roles for the US and Canadian national eventing teams, and was president of the United States Equestrian Federation from 2004 to 2012.

In 2009, he was inducted to the United States Eventing Association's Hall of Fame, and two of his horses have been granted the same honor.

At the 2000 Summer Olympics, again riding Custom Made, he took the gold medal, and helped the US team to a bronze aboard Giltedge.

[1] During the individual competition at the 2000 Games, he led each stage of the event, and made Olympic history with a record-breaking dressage score.

[10] Again riding Giltedge, O'Connor won silver at the 1999 Pan American Games and assisted the US team to a gold medal.

[11][12] In 2004, O'Connor retired from competition and quickly became involved in administrative aspects of the three-day eventing world.

[2] O'Connor was also named The Chronicle of the Horse's Eventing Horseman of the Year in 1996, in combination with his wife, Karen.

In 1997, O'Connor was awarded the Whitney Stone Cup, an annual award by the United States Equestrian Federation which honors "an active competitor who displays consistent excellence in international competition and high standards of sportsmanlike conduct while serving as an ambassador for the United States and equestrian sport.

[2] In 2009, O'Connor and Custom Made were inducted into the USEA Hall of Fame, and in 2012 Giltedge was awarded the same honor.