The 1977 Colgate-Palmolive Grand Prix was a professional tennis circuit administered by the International Lawn Tennis Federation which served as a forerunner to the current Association of Tennis Professionals (ATP) World Tour and the Women's Tennis Association (WTA) Tour. The circuit consisted of the four modern Grand Slam tournaments and open tournaments recognised by the ILTF. The Colgate-Palmolive Masters is included in this calendar but did not count towards the Grand Prix ranking. Colgate-Palmolive was the new tour sponsor, taking over from Commercial Union. Guillermo Vilas won the Grand Prix circuit, having accumulated the most points (2,047), and received the largest share from the bonus pool ($300,000). The top eight points ranked singles players as well as the top four doubles teams qualified for the season-ending Masters tournament

Guillermo Vilas is an Argentine former professional tennis player. Vilas was the world No. 1 of the Grand Prix seasons in 1974, 1975 and 1977. He won four major titles, the year-end championships, and 78 career singles titles overall, 62 of which were ATP titles. World Tennis, Agence France-Presse and Livre d'or du tennis 1977, among other rankings and publications, rated him as world No. 1 in 1977. In the computerized ATP rankings, he peaked at No. 2 in April 1975, a position he held for a total of 83 weeks, although some have argued that Vilas should have been ranked No. 1 for at least 10 weeks, particularly in 1977 when he won 2 majors. He was inducted into the International Tennis Hall of Fame in 1991, two years after his first retirement.