Prince Nashimoto Moriosa (梨本宮 守脩親王, Nashimoto-no-miya Moriosa-shinnō, 16 December 1819 – 2 December 1885) was the founder of a collateral line of the Japanese imperial family.

Prince Moriosa was born in Kyoto, the 10th son of Prince Fushimi Sadayoshi (1775–1841), the nineteenth head of the Fushimi-no-miya, the oldest of the four branches of the imperial dynasty allowed to provide a successor to the Chrysanthemum throne should the main imperial house fail to produce an heir.

He was adopted by Emperor Kōkaku, but later became a Buddhist priest at the monzeki temple of Emman-in.

After the Meiji Restoration, in 1868, Emperor Meiji recalled him (along with all other Imperial princes residing in Buddhist temples) to secular status, and he resumed the secular name Moriosa-ō.

In 1870, Emperor Meiji granted him the title Nashimoto-no-miya and permission to form a new princely house (ōke).