Diego Sebastian Galeano (born 1 February 1992) is a Paraguayan former professional tennis player.

He represented Paraguay at the 2010 Summer Youth Olympics, where he lost a bronze medal playoff in the doubles.

[2][3] In 2015 he competed at the Pan American Games in Toronto and won a bronze medal in the mixed doubles, partnering Verónica Cepede Royg.

He made it through to the quarter-finals of the singles draw, beating seeded players Marcelo Arévalo and Giovanni Lapentti en route.

[4] Galeano has featured in a total of 13 ties for the Paraguay Davis Cup team, most recently in 2018.