| Nagao Harukage 長尾 晴景 | |
| Birth Date: | 1509 |
| Office: | Head of Nagao clan |
| Term Start: | 1536 |
| Term End: | 1548 |
| Predecessor: | Nagao Tamekage |
| Successor: | Uesugi Kenshin |
| Allegiance: | Uesugi clan |
| Rank: | Lord (Daimyō) |
| Unit: | Nagao clan |
| Father: | Nagao Tamekage |
| Relatives: | Uesugi Kenshin (brother) |
| Nationality: | Japanese |
was Uesugi Kenshin's older brother, and successor to his father Nagao Tamekage in 1536.
It would seem that Harukage hadn't proven the most effective or inspiring leader (probably due to ill health), and his failure to exert control and gain support of the powerful kokujin families had resulted in a situation which was nearly to the point of tearing the province apart.
As the story is told, at first Kenshin was reluctant to take the field against his own brother, but was eventually convinced that it was necessary to the survival of Echigo.
Kenshin succeeded in wresting control of the clan from Harukage in 1548. Harukage stepped down from the lead of the clan and provincial government, and gave the titles to his younger brother. Harukage died five years later in 1553.