Eugène Collache (1850s?-?) was an officer of the French Navy in the 19th century. Based on the ship Minerva of the French Oriental Fleet, he deserted when the ship was anchored at Yokohama harbour, with his friend Henri Nicol to rally other French officers, led by Jules Brunet, who had embraced the cause of the Bakufu in the Boshin War. On November 29, 1868, Eugène Collache and Nicol left Yokohama on board a commercial ship, the Sophie-Hélène, chartered by a Swiss businessman. He wrote "An Adventure in Japan 1868 - 1869" ("Une aventure au Japon 1868-1869"), which was published in 1874.