Facundo Bagnis (Spanish pronunciation: [faˈkundo ˈβaɣnis];[2][a] born 27 February 1990)[1] is an Argentine professional tennis player.

Bagnis played in his first ATP World Tour match at the 2011 Movistar Open on January 31, 2011, losing to Santiago Giraldo in three sets,.

In 2021, Bagnis recorded his first ATP semifinal at the Córdoba Open, where he lost to fifth seed Albert Ramos Viñolas in three sets.

At the 2021 US Open, he reached the third round of a Major for the first time in his career, defeating Taro Daniel and qualifier and fellow Argentine Marco Trungelliti.

207, as a qualifier at the 2024 Córdoba Open[4] he recorded his 40th career main draw win, defeating wildcard Juan Manuel Cerúndolo.

[7] He was the oldest player from South America to make an ATP event final in the Open Era surpassing Guillermo Vilas in 1986 Forest Hills.