Today’s famous athlete birthdays for March 21 includes Ronaldinho, Adrian Peterson and one of Cleveland’s most beloved athletes

March 21, 2026, marks another trip around the sun for three of the most recognizable names in global sport. Brazilian soccer icon Ronaldinho, former NFL Most Valuable Player Adrian Peterson, and a cherished Cleveland sports figure headline the list of athlete birthdays being celebrated today.

Ronaldinho, whose dazzling footwork and irrepressible smile redefined attacking soccer in the 2000s, turns another year older with fans around the world revisiting his signature no-look passes and free-kick sorcery. Alongside him, Adrian Peterson—the bruising running back whose 2012 MVP campaign included a 2,000-yard rushing season—receives birthday tributes from football aficionados who still marvel at his combination of speed and power.

Completing the trifecta is one of Cleveland’s most beloved athletes, whose identity is being highlighted in photo galleries and social media shout-outs throughout the day. Readers clicking through the birthday roundup will find snapshots of each star plus a fun fact attached to every profile, offering a quick dose of nostalgia and trivia for sports fans.