Nao Hibino (日比野 菜緒, Hibino Nao, born 28 November 1994) is a Japanese tennis player. On 18 January 2016, she reached her career-high singles ranking of world No. 56. On 31 July 2017, she peaked at No. 43 in the doubles rankings. In 2015, she won her first WTA title at the Tashkent Open.
Hibino made her WTA main-draw debut at the Japan Women's Open, in the doubles event where she partnered Riko Sawayanagi. They lost in the first round to Yurika Sema and Erika Sema. Prior to her main-draw debut she had won four singles and two doubles titles on the ITF Women's Circuit. In 2015, she made her Grand Slam debut at the US Open where she defeated Anna Tatishvili in the first qualifying round.
In 2015, Hibino reached the final of the Fukuoka International Women's Cup where she lost to Kristýna Plíšková. The following week she won the Kurume Best Amenity Cup, defeating Eri Hozumi in the final, 6–3, 6–1. Hibino made her debut at Wimbledon, defeating Ayumi Morita in the first qualifying round before losing to Anna Tatishvili. Her second $50,000 title came at the Stockton Challenge, defeating Belgian An-Sophie Mestach in the final. This was Hibino's first singles title outside Japan. Her rise continued when she continued her good results at the Gold River Challenge and the Kentucky Bank Tennis Championships, reaching the semifinals and winning the title, respectively. At the US Open, Hibino reached the final qualifying round, defeating Tereza Martincová and Eri Hozumi before losing to Kateryna Bondarenko.