The 1981 Volvo Grand Prix was the only men's professional tennis circuit held that year. It consisted of the four Grand Slam tournaments and the Grand Prix tournaments. The World Championship Tennis (WCT) Tour was incorporated into the Grand Prix circuit. The WCT tour consisted of eight regular tournaments, a season's final, three tournaments categorized as special events and a doubles championship. In total 89 tournaments were held divided over 29 countries. The circuit was administered by the Men's International Professional Tennis Council (MIPTC).