Hideroku Hara (原 秀六; born 1956) is a Japanese legal scholar and professor emeritus at Shiga University. He was granted the degree of Doctor of Philosophy in Law for his study of The Legal Theory on the Distribution of the Synergistic Effects caused by Mergers from Waseda University and the highest-ranking qualification called "D-maru-gō" from Ministry of Education, Culture, Sports, Science and Technology. His research covers Commercial law, Corporate Law and Securities.