Mariya Nagao is a Japanese tarento, a former member of the Japanese idol girl group AKB48. Mariya Nagao joined AKB48 as a 9th generation trainee in late 2009.

On December 8, 2010, together with Mina Oba, Haruka Shimazaki, Haruka Shimada, Miyu Takeuchi, Mariko Nakamura, Anna Mori, and Suzuran Yamauchi, she was promoted to a full member, but stayed unassigned to any of the three teams until 2011 when Team 4 was formed. In the 2012 AKB48 elections (AKB48 27th Single Senbatsu Sōsenkyo) Mariya Nagao placed 39th. On November 1, 2012, she was transferred to Team K.