Ousseini Tinni (an haife shi ne a ranar 10 ga watang Disamban shekarar 1954) ɗan siyasan Nijar ne na Jam’iyyar Nijar don Demokraɗiyya da Gurguzu . Ya kasance shugaban majalisar kasa tun 25 ga Maris 2016. An haifi Tinni a Tinoma, a cikin Yankin Dosso . Ya tafi makarantar sakandare a Marseille, Faransa, kuma daga baya ya halarci Ecole Supérieure et des Techniques Economiques a Lomé, Togo. Daga baya Tinni yayi aiki a matsayin ma'aikacin gwamnati a ma'aikatu da sassan gwamnati da dama. A zaben watan Fabrairun 2016, an zabe shi ga Majalisar Dokoki ta kasa a matsayin dan takarar PNDS. A ranar 25 ga Maris 2016 an zabe shi Shugaban Majalisar Dokoki ta Kasa da kuri’u 109 cikin kuri’u 118 da ke goyon baya. Wakilan adawa sun kauracewa zaben.