Rainel Rosario (born March 29, 1989) is a Dominican-Mexican professional baseball outfielder for the Bravos de León of the Mexican League.

He split the 2010 season between the Low-A Batavia Muckdogs and the Single-A Quad Cities River Bandits, accumulating a .284/.387/.507 batting line in 64 games.

On December 12, 2015 he signed a minor league contract with the Boston Red Sox and was assigned to their Double-A affiliate, the Portland Sea Dogs, to start the 2016 season.

He split the year between Portland and the Triple-A Pawtucket Red Sox, batting .248 in 103 games between the two clubs before electing free agency on November 7, 2016.

On June 14, 2024, Rosario and Henry Urrutia were traded to the Bravos de León of the Mexican League in exchange for infielders Keven Lamas and Alejandro Mejía.