The meeting was held in Milwaukee and ended with a score of 103:101.
Bucks forward Giannis Antetokounmpo led the game with 42 points, 12 rebounds and eight assists.
Jaylen Brown recorded 27 points and 12 rebounds for the Celtics.
Thus, Milwaukee again took the lead in the series - 2-1.
The fourth game between the teams will take place on May 10.
Luka Doncic's double-double helped the Dallas Mavericks defeat the Phoenix Suns in the NBA playoffs.