Lake Kizaki (木崎湖, Kizaki-ko) is a lake, situated near Ōmachi, Nagano, Japan, and located at the foot of the northern Japanese Alps mountain range. Mesotrophic and subalpine in nature, numerous lakeside attractions surround the lake, with the locale being a popular lakeside resort. Kizaki is also one of the "Nishina Three Lakes", which include Lake Aoki and Lake Nakatsuna. Lake Kizaki has a maximum length of 2.7 km and a maximum width of 1.2 km, with the altitude of its surface reaching 764 m and its catchment area being 22 square kilometers. There are three train stations located near Kizaki Lake: Shinano-Kizaki, Inao, and Uminokuchi, all on the JR Ōito Line.