Kim Antonie Lode Clijsters (born 8 June 1983) is a Belgian professional tennis player. Clijsters has been a world No. 1 in both singles and doubles, having held both rankings simultaneously in 2003. She has won a total of six Grand Slam tournament titles, four in singles and two in doubles.

Clijsters has competed professionally from 1997 in an era in which her primary rivals were compatriot Justine Henin and 23-time Grand Slam singles champion Serena Williams. Coming from a country with limited success in men's or women's tennis, Clijsters became the first Belgian player to attain the No. 1 ranking. Together with Henin, she established Belgium as a leading force in women's tennis as the two of them led their country to their first Fed Cup crown in 2001 and were the top two players in the world in late 2003.

Plagued by injuries and having lost some of her desire to compete, Clijsters initially retired from tennis in 2007 at the age of 23 to get married and have a daughter. She returned to the sport two years later and won her second US Open title as an unranked player in just her third tournament back.

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