Daniela Hantuchová (Slovak pronunciation: [ˈdaɲɪ̯ɛla ˈɦantuxɔʋaː]; born 23 April 1983) is a retired Slovak tennis player. She turned professional in 1999 and had her breakthrough year in 2002, when she won her first WTA tournament, the Indian Wells Masters, defeating Martina Hingis in the final and becoming the lowest-ranked player to ever win the tournament. She also reached the quarterfinals of that year's Wimbledon Championships and US Open, ending the year in the top ten. She was part of the Slovak team that won the 2002 Fed Cup and the 2005 Hopman Cup.
Hantuchová reached her highest ranking of world No. 5 in January 2003, after playing the quarterfinals of the Australian Open. She has won seven WTA tournaments, including the Indian Wells Masters for a second time in 2007, with the 2015 Thailand Open being her last victory. She also reached the semifinals of the Australian Open in 2008, her best result in a Grand Slam tournament. Her biggest career wins include victories over defending champion Serena Williams in the third round of the 2006 Australian Open and world No. 1 Caroline Wozniacki in the third round of the 2011 French Open. Hantuchová became the 37th woman in the Open Era to reach 500 career wins when she beat Laura Robson in the second round of the Aegon Classic in June 2013.
Hantuchová is also an accomplished doubles player, achieving a career-high doubles ranking of world No. 5. In 2005, she completed the career Grand Slam in mixed doubles, becoming only the fifth female tennis player to do so. She won the mixed doubles at Wimbledon in 2001 with Leoš Friedl, at the Australian Open in 2002 with Kevin Ullyett, at the French Open in 2005 with Fabrice Santoro and at the US Open in 2005 with Mahesh Bhupathi. She has also reached the finals of the mixed doubles at Wimbledon in 2002 with Ullyett and the finals of the women's doubles at the Australian Open in 2002 with Arantxa Sánchez Vicario, at the French Open in 2006 with Ai Sugiyama and at the Australian Open in 2009 with Sugiyama.
Hantuchová announced her retirement from professional tennis on 6 July 2017.