Less than 150 days after the opening ceremony of Napoli 2019, the Countries competing in all the sports teams have been outlined. For football, basketball, volleyball, water polo and rugby there will be both men's and women's teams, whereas the sailing teams will be mixed.

Therefore many of them will try to defend the gold medal won in Taipei in 2017, like Japan in the men's soccer tournament or Australia in the women's basketball competition. Great curiosity for two of the three optional sports of Napoli 2019: Rugby will make its second appearance at a Summer Universiade (the first and only one was in Kazan' in 2013), whereas sailing will appear for the third time after Palma de Mallorca in 1999 and Shenzen in 2011.

The list below shows all the Countries participating in the various sports: