Born in Nouakchott in Mauritania. After studying business, Ousmane Diagana turned to cinema and trained in directing and editing at the Maison des Cinéastes in Nouakchott. He also participated in several documentary writing residencies, before obtaining a degree in documentary filmmaking at the Jules Verne University in Amiens, France.
In 2011, he directed his first documentary "The Wound of Slavery".
LA BLESSURE DE L'ESCLAVAGE - 2011
(Best Documentary Award at the Senaf International Festival, 2011; Grand prix liondaade 2013 Paris (France); Award of progressive film 2013 New York (USA))
MÉMOIRE NOIRE - 2013
(Grand prize of the audience at the 20th World Cinema Festival France 2015)
GANDA, THE LAST GRIOT - 2018
(Special prize at the African film festival of Khouribga Morocco 2019; Grand prize at the festival of cultural identities Ouagadougou 2019)