The 1999 Open Gaz de France was a women's tennis tournament played on indoor hardcourts at the Stade Pierre de Coubertin in Paris in France that was part of Tier II of the 1999 WTA Tour. It was the seventh edition of the tournament and was held from 22 February until 28 February 1999. Unseeded Serena Williams won the singles title and earned $80,000 first-prize money. It was her first WTA singles title. On the same day her sister Venus won the IGA Superthrift Tennis Classic tournament, making them the first sisters to win WTA events in the same week.
Finals
Singles
Serena Williams defeated Amélie Mauresmo, 6–2, 3–6, 7–6(7–4) It was Williams' 1st singles title of her career.
Doubles
Irina Spîrlea / Caroline Vis defeated Elena Likhovtseva / Ai Sugiyama, 7–5, 3–6, 6–3
Entrants
Seeds
Other entrants
The following players received wildcards into the singles main draw: Émilie Loit Sabine Appelmans Amélie Cocheteux
The following players received wildcards into the doubles main draw: Amélie Cocheteux / Nathalie Dechy
The following players received entry from the singles qualifying draw: Sandra Načuk Karina Habšudová Anne-Gaëlle Sidot Åsa Carlsson
The following players received entry as lucky losers: Laurence Andretto Sandra Kleinová Laurence Courtois
The following players received entry from the doubles qualifying draw: Eleni Daniilidou / Sandra Načuk