Katja Koroleva

Ekaterina "Katja" Koroleva (Екатерина «Катя» Королева; born March 20, 1987) is an international soccer referee for the Professional Referee Organization. Born in the Soviet Union, she represents the United States.

Koroleva officiates matches in the National Women's Soccer League (NWSL) and the United Soccer League as a referee, and in Major League Soccer as a video assistant referee. Koroleva was the referee for the NWSL Championship in 2015 and 2023.

She is also a mid-level practitioner at Cascade Valley Hospital in Arlington, Washington, United States.

In August 2016, Koroleva was appointed to be a referee at the 2016 FIFA U-17 Women's World Cup in Jordan. She was appointed in August 2018 to referee at the 2018 FIFA U-17 Women's World Cup in Uruguay.

Koroleva was appointed to be an official at the 2019 FIFA Women's World Cup in France. On January 9, 2023, FIFA appointed her to the officiating pool for the 2023 FIFA Women's World Cup in Australia and New Zealand.