Kristiina is an Estonian and Finnish feminine given name. It is a cognate of the English and French given name Christine. Tiina is often used as a diminutive of Kristiina.

People named Kristiina include:

• Kristiina Brask (born 1990), Finnish pop singer
• Kristiina Ehin (born 1977), Estonian singer, poet and translator
• Kristiina Elstelä (1943–2016), Finnish actress
• Kristiina Halttu (born 1963), Finnish actress
• Kristiina Kass (born 1970), Estonian children's writer and illustrator
• Kristiina Kolehmainen (1956–2012), Finnish-Swedish librarian and translator
• Kristiina Lassus (born 1966), Finnish product designer and interior architect
• Kristiina Mäkelä (born 1992), Finnish athlete (triple jump)
• Kristiina Mäki (born 1991), Finnish-born Czech runner
• Kristiina Nurk (born 1972), Estonian underwater swimmer
• Kristiina Ojuland (born 1966), Estonian politician
• Kristiina Poska (born 1978), Estonian conductor
• Kristiina Ross (born 1955), Estonian linguist and translator
• Kristiina Rove (born 1990), Finnish alpine ski racer
• Kristiina Tullus (born 1998), Estonian footballer
• Kristiina Wegelius (born 1960), Finnish figure skater
• Kristiina Wheeler (born 1983), English-Finnish singer