Hōzōin-ryū is a traditional school of Japanese martial arts that specializes in the art of spearmanship. Hōzōin-ryū was founded by Hōzōin Kakuzenbō In'ei in c. 1560. In'ei was a Buddhist monk of Kōfuku-ji Temple in Nara, Japan. He adored martial arts and trained in the art of swordsmanship.