Virginia Ruano Pascual and Paola Suárez were the two-time defending champions, but were defeated in the final by Kim Clijsters and Ai Sugiyama 7–6(7–5), 2–6, 7–9.
Serena and Venus Williams were the defending champions, but lost in the third round to Elena Dementieva and Lina Krasnoroutskaya.
Serena Williams and Venus Williams were the defending champions, but Serena withdrew from the tournament and Venus didn't want to participate with another player.
Tathiana Garbin and Rita Grande were the defending champions. Garbin did not participate, whilst Grande partnered Emmanuelle Gagliardi, losing in the first round.
Virginia Ruano Pascual and Paola Suárez were the defending champions and won in the final 6–2, 6–3, against Svetlana Kuznetsova and Martina Navratilova in straight sets. This was Ruano Pascual's 4th career Grand Slam doubles title and her 2nd title at the US Open. It was also Suárez' 4th career Grand Slam doubles title and her 2nd title at the US Open.
Virginia Ruano Pascual and Paola Suárez were the defending champions, but lost in quarterfinals to Els Callens and Émilie Loit.
Petra Mandula and Patricia Wartusch were the defending champions, but Mandula did not compete this year. Wartusch teamed up with Barbara Schett and lost in quarterfinals to Kira Nagy and Adriana Serra Zanetti.
Anna Kournikova and Janet Lee were the defending champions, but Kournikova did not compete this year. Lee teamed up with Corina Morariu and lost in quarterfinals to Ai Sugiyama and Tamarine Tanasugarn.
The 2003 Croatian Bol Ladies Open was a women's tennis tournament played on outdoor clay courts in Bol, Croatia and was part of the Tier III category of the 2003 WTA Tour. It was the tenth edition of the tournament and was held from 28 April until 4 May 2003. Third-seeded Vera Zvonareva won the singles title and earned $27,000 first-prize money.
Fabiola Zuluaga was the defending champion, but lost in second round to runner-up Tathiana Garbin.
Tathiana Garbin and Émilie Loit were the defending champions, but Garbin opted to compete in Hobart that same week. Loit teamed up with Stéphanie Cohen-Aloro and withdrew the tournament in semifinals.
Elena Bovina and Zsófia Gubacsi were the defending champions, but Bovina decided to compete in Charleston at the same week. Gubacsi teamed up with Katarina Dašković and lost in first round to wildcards Vanessa Menga and Ana Catarina Nogueira.
Cara Black and Liezel Huber were the defending champions, but Huber did not compete this year. Black teamed up with Elena Likhovtseva and lost in semifinals to tournament winners Svetlana Kuznetsova and Arantxa Sánchez Vicario.
Kim Clijsters and Laurence Courtois were the defending champions, but neither competed this year.
Yayuk Basuki and Caroline Vis were the defending champions, but Vis did not compete this year. Basuki teamed up with Tamarine Tanasugarn and lost in semifinals to tournament winners Åsa Carlsson and Iroda Tulyaganova.
Marie-Gaïané Mikaelian was the defending champion from 2002, but she chose not to compete in 2003.
Tatiana Perebiynis and Tatiana Poutchek were the defending champions, but Perebiynis did not compete this year. Poutchek teamed up with Yuliya Beygelzimer and successfully defended her title, by defeating Li Ting and Sun Tiantian 6–3, 7–6(7–0) in the final.
Petra Mandula and Patricia Wartusch were the defending champions from 2001, but they chose not to compete in 2002.
Lubomira Bacheva and Åsa Svensson were the defending champions, but both players chose to compete at Palermo in the same week.
Tathiana Garbin and Janette Husárová were the defending champions, but none competed this year. Husárová chose to compete at Charleston in the same week.
Petra Mandula 
Patricia Wartusch 
Emmanuelle Gagliardi 
