My Brother Yves (French: Mon Frère Yves, 1883) is a semi-autobiographical novel by French author Pierre Loti. It describes the friendship between French naval officer Pierre Loti and a hard drinking Breton sailor Yves Kermadec during the 1870s and 80s. It was probably Loti's best-known book, and its descriptions of Breton seafaring life, on board ship and on shore, set the tone for his later acclaimed work An Iceland Fisherman (1886). The relationship between Loti and Yves Kermadec also plays a role in Fleurs d'ennui (1882), and Madame Chrysanthème (1887).