Yes, Harry is the Gryffindor Quidditch Captain in HBP. In the book, there is the chapter when he is trying out all the players and it turns into a total riot, but he gets himself a great team! The first game against Slytherin was a success( the picture I added, is of the after-party in Gryffindor's common room.)He also gats himself a detention during the final match against Ravenclaw, but the team ends up winning, and wins the Quidditch Cup, placing number one for that year. It was the only 년 Harry served as Quidditch Captain, as he wasn't at school the following year.