Kristina "Tina" Cook (née Gifford, born 31 August 1970), is a British three-day eventing rider.

[1] Riding Miners Frolic, she won bronze medals in both the individual and team eventing at the 2008 Summer Olympics in Beijing.

[2] Cook only made the Olympic Eventing team, after the withdrawals of Zara Phillips and Lucy Wiegersma.

She became double European Eventing champion in 2009 on Miners Frolic in both the Individual and Team competitions at the championships at Fontainebleau in France.

[4] She was then picked for the team in the 2014 World Equestrian Games with her homebred horse De Novo News.