Jacoba ("Coby") Maria Jozina van Baalen-Dorresteijn (born April 6, 1957 in Werkhoven, Utrecht) is an equestrian from the Netherlands, who won the silver medal in the Team Dressage event at the 2000 Summer Olympics in Sydney, Australia. She did so alongside Anky van Grunsven, Ellen Bontje, and Arjen Teeuwissen. In the Individual Competition Van Baalen finished in fifth position. Her daughter Marlies van Baalen is also an Olympic equestrian. Van Baalen competed in the Olympics with a KWPN stallion called Ferro, also known as Olympic Ferro.