Osvaldo Alonso Moreno (born November 11, 1985) is a Cuban former professional footballer who played as a defensive midfielder.

During his decade-long career with Seattle Sounders FC, Alonso played as a defensive midfielder who was known for his style of harassing, tackling and covering the field, while getting forward to supply enough offense to be considered a threat.

[3] Alonso began his career with Pinar del Río in his homeland, after which he defected to the United States in June 2007.

After missing three matches with a quadriceps strain, Alonso returned to score on a long-range blast against D.C. United on June 17.

Alonso missed eight games due to a quadriceps strain that happened on May 8 and returned against FC Dallas on July 11.

[citation needed] In 2012, Alonso was named to the MLS Best XI for the first time in after a stellar season in midfield, leading the team with 30 starts.

He was named the 2012 U.S. Open Cup Player of the Tournament after scoring four goals and two assists in four games, including the winner against Atlanta on May 30 and a 30-yard volley against Cal FC on June 5.

[12] A trade did not materialize, and Alonso went on to make 38 league and playoff appearances for the 2016 MLS Cup winning Sounders.

[13] He picked up an injury during the playoffs for the third season in a row during the second leg of the Western Conference Finals against the Colorado Rapids when a collision led to a sprained knee.

[citation needed] Head coach Brian Schmetzer praised Alonso for his determination and service to the club after the victory.

[16] Following his release by Seattle, Alonso joined Minnesota United FC on January 10, 2019, having been the last Sounders player to have played for the club from its first season in MLS.

[21] Alonso returned to play as a substitute for reserve side Atlanta United 2 in MLS Next Pro on June 4, 2023.

[25][26] Alonso served as captain of the Cuba U-23 national team during qualification for the men's football tournament at the 2008 Summer Olympics.

In June 2007, Alonso defected from Cuba while the team was in Houston, Texas, to face Honduras at the Gold Cup.

[5][27] He walked several blocks from the store until he found a man who spoke Spanish and borrowed a cell phone to call a friend in Miami, Florida.