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Yuki Nagato (長門 有希 Nagato Yuki) is a main character in the Haruhi Suzumiya franchise (original light novel series, TV anime, and manga). She also appears as the main protagonist of The Disappearance of Nagato Yuki-chan.

Yuki is commonly known by her surname Nagato without any honorific (which is not unusual). For example, Kyon calls her "Nagato", as opposed to how he calls Haruhi Suzumiya by her given name (Haruhi) and Mikuru Asahina by her surname with honorific (Asahina-san).