Karly Marie Gustafson Auffant (born 7 April 1995) is an American-born Puerto Rican retired footballer who has played as a goalkeeper. She has been a member of the Puerto Rico women's national team.
Gustafson was raised in Fayetteville, North Carolina. She attended Terry Sanford High School in Fayetteville and played soccer all four years.
Gustafson capped for Puerto Rico at senior level during the 2016 CONCACAF Women's Olympic Qualifying Championship.