Cian O'Connor (1980-) is an Irish show jumper, who took a gold medal at the 2004 Olympics in the individual show jumping class riding his horse Waterford Crystal. He became an instance national hero, being the only Irish medalist of that year.

On the 8th of October 2004 it emerged that Cian's horse Waterford Crystal had tested positive for a prohibited substance. The 'B' sample is currently being checked.

See Also

• Ireland at the 2004 Summer Olympics
• List of Irish sports people