Mount Iizuna(飯縄山,Iizuna-yama?), also known as Mount Izuna(飯綱山,Izuna-yama?), is a mountain located ten kilometers north-northwest of the heart of Nagano, Nagano Prefecture, Japan. Together with Mount Reisenji (霊仙寺山,Resenji-yama?), Mount Menō (瑪瑙山,Menō-yama?), and others, it forms the Iizuna range. It has an elevation of 1,917 metres.
This mountain is a sacred site for mountain-based religious sects such as Shugendo, and said to be the home of a tengu named Saburō. According to legend, there was once a strange, edible sand somewhere on the mountain, which the tengu would distribute in times of poor harvest.