Giovanni Alejandro Reyna (born November 13, 2002) is an American professional soccer player who plays as an attacking midfielder or winger for Bundesliga club Borussia Dortmund and the United States national team.

[8] On January 18, 2020, Reyna made his Bundesliga debut for Borussia Dortmund, coming on as a substitute in the 72nd minute, in a 5–3 win against FC Augsburg.

[3] On February 18, 2020, Reyna became the third-youngest player ever to appear in a knockout game of the UEFA Champions League when he came on as a substitute in the 67th minute against Paris Saint-Germain.

Nine minutes later, Reyna set up Erling Haaland's game-winning goal for Borussia Dortmund in the first leg of the Round of 16, becoming the youngest American to play and record an assist in a Champions League fixture.

[10] On May 16, Reyna was set to start his first Bundesliga match for Borussia Dortmund in their derby against Schalke 04, but suffered a calf injury during warm-ups.

[15]On October 3, 2020, in his third league appearance of the 2020–21 season, Reyna assisted 3 goals—a brace to Erling Haaland and an Emre Can header from a corner kick, to beat SC Freiburg 4–0.

[16] As a result, Reyna became the first American to record a hat trick of assists in one of the 5 major European leagues since Steve Cherundolo did it for Hannover in March 2008, and the youngest player to ever do so in the Bundesliga.

His involvement in the match marks him as the youngest American to appear in a domestic cup final in Europe, a record previously held by his international teammate Christian Pulisic.

[20] On July 28, 2021, Dortmund announced that Reyna would wear the number 7 shirt for the upcoming season, previously worn by Jadon Sancho.

[30] On January 31, 2024, Reyna extended his contract with Borussia Dortmund until June 30, 2026, and was subsequently loaned to Premier League club Nottingham Forest until the end of the 2023–24 season.

[41] On December 12, 2022, Reyna confirmed that he was the aforementioned player about whom Berhalter was speaking, and apologized for his behavior while criticizing the decision to publicize the information.

[43] During the 2023 CONCACAF Nations League, Reyna recorded two assists in the United States' 2–0 victory over Canada in the final, where he was named man of the match.

[51] Ultimately, in a March 2020 interview with Sports Illustrated, Reyna declared his intent to play for the United States: "I'm aware of the rumors, but it's quite clear for me.

[53] Reyna is close friends with United States teammate Joe Scally; both players began attending the New York City FC youth academy in 2015.