Yonekura Masanaga (米倉 昌寿, February 21, 1793 – May 7, 1863) was the 7th daimyō of Mutsuura Domain in southern Musashi Province, Honshū, Japan (modern-day Kanazawa-ku, Yokohama, Kanagawa Prefecture) and 10th head of the Yonekura clan.
Yonekura Masanaga was born as the 3rd son of Kutsuki Masatsuna, daimyō of Fukuchiyama Domain in Tango Province.
In June 1812, he was presented before shōgun Tokugawa Ienari and confirmed as the daimyō of Mutsuura.
As daimyō, Yonekura Masanaga was assigned to several ceremonial postings as guard of various gates to Edo Castle.
On June 24, 1860, he turned his titles over to his 6th son, Yonekura Masakoto, and went into retirement.