Gustave Émile Boissonade de Fontarabie (7 June 1825 – 27 June 1910) was a French legal scholar, responsible for drafting much of Japan's civil code during the Meiji Era, and honored as one of the founders of modern Japan's legal system.

In 1873 he was invited to lecture on constitutional and criminal law to some Japanese visitors to Paris, and received an invitation to work in Japan by the Japanese Ministry of Justice as one of several foreign legal scholars needed to assist with the drafting of Japan's legal codes and in the renegotiation of the unequal treaties.

Boissonade remained in Japan for more than 21 years, from 1873 to 1895, and worked as an instructor in the Law School of the Ministry of Justice.

He worked closely with Ume Kenjirō and Hozumi Nobushige in drafting much of Japan's criminal and civil law.

He also opposed Inoue Kaoru's 1887 proposal to allow non-Japanese judges, and cautioned against too rapid movement towards revision of the unequal treaties.