Kateryna Oleksandrivna Dolzhykova (; born September 25, 1988, in Kyiv) is a Ukrainian chess player (representing Germany since 2023) holding the title Woman Grandmaster (WGM).
She won the Ukrainian women's championship in 2011. Dolzhykova played on the silver medalâÂÂwinning Ukrainian team in the women's team event of rapid chess at the 2008 World Mind Sports Games.
On July 24, 2009, she married chess grandmaster Sergey Karjakin. The marriage later broke up. Her sister Olga Dolzhykova is also a chess player, who holds the title of Woman Grandmaster (WGM).