Eileen Feng Gu (born September 3, 2003), also known by her Chinese name Gu Ailing (Chinese: 谷爱凌), is a freestyle skier. Born in the United States, she has competed for China in halfpipe, slopestyle, and big air events since 2019.

At age 18, Gu became the youngest Olympic champion in freestyle skiing after winning gold medals in big air and halfpipe, and a silver medal in slopestyle, at the 2022 Winter Olympics in Beijing. She is the first freestyle skier to win three medals at a single Winter Olympics. Her decision to compete for China was controversial, drawing international attention.

Time named her as one of the 100 most influential people in the world under the 'Pioneers' category on its annual list in 2022. Forbes listed her as the second-highest earning female athlete in the world in 2023.