Haikyuu!! has had a significant impact on the popularity of volleyball outside Japan by introducing the sport to a wider audience through its engaging storyline, dynamic characters, and accurate portrayal of volleyball techniques and strategies. The anime has sparked interest in volleyball among viewers around the world, leading to an increase in participation in the sport and a growing fanbase globally. Additionally, Haikyuu!! has inspired fans to learn more about volleyball, watch real matches, and even take up the sport themselves, contributing to the sport's increased visibility and popularity internationally.