Sidney Ponson (born November 2, 1976, in Noord, Aruba) is a Major League Baseball pitcher who plays for the St. Louis Cardinals. Prior to signing with the Cardinals, Ponson played most of his career with the Baltimore Orioles. When he made his debut for the Orioles in 1998, he became the third player from Aruba to play in the major leagues.
Ponson attended Maria College in Aruba. He was picked up by the Orioles as an amateur in 1993.
After the 2003 season, he was made a knight by Queen Beatrix of the Netherlands. (Aruba is a colony of the Netherlands.) This has earned him the nickname "Sir Sidney."