The 1981 Monterrey WCT was a men's tennis tournament played on indoor carpet courts in Monterrey, Mexico.

The event was part of the WCT Tour which was incorporated into the 1981 Volvo Grand Prix circuit.

It was the third edition of the tournament and was held from January 19 through January 25, 1981.

Fourth-seeded Johan Kriek won the singles title.

[3] Johan Kriek defeated Vitas Gerulaitis 7–6, 3–6, 7–6 Kevin Curren / Steve Denton defeated Johan Kriek / Russell Simpson 7–6, 6–3