The 1991 Grand Prix de Tennis de Toulouse was a men's tennis tournament played on indoor carpet in Toulouse, France that was part of the World Series of the 1991 ATP Tour. It was the tenth edition of the tournament and was held from 30 September until 6 October 1991.^[1]

Champion seeds are indicated in bold text while text in italics indicates the round in which those seeds were eliminated.

	First round							Quarterfinals							Semifinals							Final
	1	N Broad S Kruger	7	6
		J Brown S Melville	5	3				1	N Broad S Kruger	6	3	4
		C Pioline M Rosset	6	3	6				C Pioline M Rosset	1	6	6
		K Kinnear B Talbot	3	6	3											C Pioline M Rosset	6	4	4
		J Bates K Curren	6	6	6											J Bates K Curren	4	6	6
	4	T Carbonell D Macpherson	7	3	3				J Bates K Curren	6	3	6
		HJ Davids L Pimek	6	6					HJ Davids L Pimek	3	6	3
		C Beckman S Salumaa	2	3																			J Bates K Curren	6	3	6
		J-P Fleurian G Raoux	7	5	6																	2	T Nijssen C Suk	4	6	7
		A Boetsch F Santoro	6	7	3				J-P Fleurian G Raoux	7	1	6
	3	R Båthman R Bergh	6	6				3	R Båthman R Bergh	6	6	4
		J Lozano G Luza	2	4												J-P Fleurian G Raoux	4	5
		M Bahrami O Delaître	7	4	6										2	T Nijssen C Suk	6	7
		R Krajicek D Vacek	6	6	4				M Bahrami O Delaître	5	2
	2	T Nijssen C Suk	6	6				2	T Nijssen C Suk	7	6
		M Gustafsson J Svensson	2	2

• ITF tournament edition details