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The purpose of this study was to investigate the kinematic and kinetic differences between American and Japanese baseball pitchers. Kinematic and kinetic data were analyzed for 11 American pitchers (21±2 y, 190±6 cm, 93±9 kg) and 11 Japanese pitchers (21±1 y, 180±6 cm, 81±7 kg) using 3D motion capture (480 Hz). The American pitchers generated faster ball velocities and increased throwing arm kinetics. At foot contact, the Japanese pitchers had longer stride length, greater shoulder external rotation, and greater elbow flexion. At the instant of maximum shoulder external rotation, American pitchers had less elbow flexion and greater pelvis rotation velocity. The kinematic and kinetic differences seen here may suggest a difference in pitching styles or training between cultures.