1998 Grand Prix de Tennis de Toulouse
Date	28 September – 4 October
Edition	17th
Category	World Series
Draw	32S / 16D
Prize money	$375,000
Surface	Hard / indoor
Location	Toulouse, France
Champions
Singles
Jan Siemerink[1]
Doubles
Olivier Delaître / Fabrice Santoro[2]
← 1997 · Grand Prix de Tennis de Toulouse · 1999 →

The 1998 Grand Prix de Tennis de Toulouse was a men's tennis tournament played on indoor hard courts in Toulouse, France that was part of the World Series of the 1998 ATP Tour. It was the seventeenth edition of the tournament and was held from 28 September until 4 October 1998. Second-seeded Jan Siemerink won the singles title.

Jan Siemerink defeated Greg Rusedski, 6–4, 6–4

• It was Siemerink's 2nd singles title of the year and the 4th and last of his career.

Olivier Delaître / Fabrice Santoro defeated Paul Haarhuis / Jan Siemerink, 6–2, 6–4

• ITF tournament edition details