Mirjana Lučić-Baroni, Croatian tennis player
Mirjana Lučić-Baroni (née Lučić; Croatian pronunciation: [mǐrjana lûtʃitɕ, - lǔː-, - lûː-]; born 9 March 1982) is a inactive Croatian professional tennis player. She enjoyed a meteoric rise on the WTA Tour in the late 1990s, during which she set several "youngest-ever" records. She captured the women's doubles title at the 1998 Australian Open when she was 15 years old, partnered with Martina Hingis. She also won the first ever professional tournament she entered, the 1997 Croatian Ladies Open, and defended it the following year at age 16, making her the youngest player in history to successfully defend a title. She then reached the semifinals of the 1999 Wimbledon Championships, beating world No. 4 Monica Seles and eighth seed Nathalie Tauziat, the previous year's finalist, before she lost to Steffi Graf in three sets. Following a series of personal problems from 2000 onwards, she faded from the scene.

After toiling on the ITF Women's Circuit through much of the next decade, Lučić re-emerged as a WTA regular following the 2010 season. In September 2014, she upset world No. 2 Simona Halep in the third round of the US Open. The following week, she beat Venus Williams at the Tournoi de Québec final to claim the title, which set the record for the longest gap between titles in the Open Era. In January 2017, almost 18 years after her first Grand Slam semifinal, Lučić-Baroni reached the semifinals of the Australian Open, upsetting two top-5-ranked players before losing to Serena Williams. Three months later, she entered the singles rankings' top 20 for the first time in her career. Lučić-Baroni has been inactive since January 2018 due to a shoulder injury.