Nana Okada (岡田 奈々, Okada Nana, born November 7, 1997 in Osaka Prefecture), also known as Naachan (なぁちゃん), is a Japanese singer. She is a member of the Japanese idol girl groups AKB48, STU48, and Tentoumu Chu! She had the reputation of being a "serious" (真面目, majime) idol early in her career due to her perfectionism,which has evolved into a more "eccentric" image in recent years. She is a fixture in AKB48's major single lineups since 2016 and is considered one of the best singers in the group.