The 1991 Bliss Cup was a men's tennis tournament held in Guarujá in Brazil and played on outdoor hardcourt.

It was part of the 1991 ATP Tour.

It was the only edition of the tournament and took place from 21 October through 28 October 1991.

Unseeded Javier Frana won the singles title.

[3] Javier Frana defeated Markus Zoecke 2–6, 7–6(7–1), 6–3 Jacco Eltingh / Paul Haarhuis defeated Bret Garnett / Todd Nelson 6–3, 7–5