Shirō Hamaguchi is a Japanese anime composer, arranger and orchestrator. He is best known for composing music to the anime franchises Girls und Panzer, One Piece, and Oh My Goddess! and arranging/orchestrating music in the Final Fantasy series. He frequently collaborates with fellow composers Kohei Tanaka and Akifumi Tada on anime scores.

Girls und Panzer , abbreviated as GuP or Garupan (ガルパン), is a Japanese franchise created by Actas which depicts a competition between girls' high schools practicing tank warfare as a sport.