Janar-Major Mahmud ibn Derby ( Larabci: محمود بن إدريس ديبي إتنو‎ Mahmūd ibn Idrīs Daybī Itnū ) shi ne Shugaban Majalisar Riƙon-kwarya ta Sojan Chadi. Shi ɗa ne ga marigayi tsohan Shugaban Chadi Idriss Déby. Ya taɓa riƙe muƙamin na biyu a kwamandan sojojin Chadi a yankin arewacin Mali (FATIM). Mahmud Déby Itno ya fara shiga makarantar haɗin gwiwa ta makarantun sojoji a Chadi. Daga baya ya sami horo a kasar Faransa, a makarantar sojoji na Aix-en-Provence . Bayan dawowarsa sai aka sanya shi a matsayi na biyu na muƙaddashin shugaban makarantar sakandare kuma daga baya aka naɗa shi zuwa reshen sabis na Tsaro na Cibiyoyin Jiha (SERS), a matsayin mataimakin kwamanda na ƙungiyar ta rashin imani. Kwarewarsa ta farko a fagen fama ya faru ne a watan Afrilu na 2006 lokacin da 'yan tawaye suka kai hari kan babban birnin ƙasar Chadi sannan daga baya suka shiga fafatawa a gabashin Chadi tare da Janar Abu Bakr al Said, sannan darektan jandarma, a lokacin an ba Mahmud muƙamin mai girma daga baya. ya jagoranci dakaru lokacin da ya shiga cikin rundunar sojojin Chadi a lokacin yaƙin Am Dam, inda sojojinsa suka fatattaki ‘yan tawaye.