Yosuke Watanuki

 is a Japanese tennis player.
On the junior tour, Watanuki has a career high combined ranking of 2 achieved on 21 March 2016. Watanuki was the winner of the 2016 Campeonato Internacional Juvenil de Tenis de Porto Alegre, a Grade A event in Porto Alegre, Brazil. His first match victory on the 2018 ATP World Tour came at the 2018 Rakuten Japan Open.
Watanuki has two brothers, Yusuke and Keisuke, who are both also professional tennis players.