Mount Saga (嵯峨山, Saga-yama) is a mountain located on the border of Futtsu and Kyonan, Chiba Prefecture.

Mount Saga has an elevation of 315.5 m (1,035 ft) and is one of the peaks of the Mineoka Mountain District of the Bōsō Hill Range.

The plantings are primarily of the Nihon variety of narcissus, which probably originated in south China and came to Japan via the Kuroshio Current.

The daimyō Matsudaira Sadanobu (1759–1829), administrator of Shirakawa Domain in present-day Fukushima Prefecture, visited the area in 1811 and noted the mountain and its narcissus cultivation in his diary.

The mountain is a popular hiking destination from late December to early February when the narcissus bloom.