Stephen Robert Blass (born April 18, 1942) is an American retired professional baseball pitcher and television sports color commentator.

[3] Signed by the Pittsburgh Pirates in 1960, he made his major league debut at the age of 22 in 1964 and joined the team permanently in 1966.

In a ten-season major league career, Blass posted a 103–76 record with 896 strikeouts and a 3.63 ERA in 1,597.1 innings pitched, including 16 shutouts and 57 complete games.

[11][12] Notable victims of "Steve Blass Disease" include Rick Ankiel,[9][13][14] Mark Wohlers,[15] Dontrelle Willis,[16] Ricky Romero,[17][18] Daniel Bard.

[22] He joined the Pirates' TV and radio broadcast team in 1983 as a part-time color commentator, earning a full-time post in 1986.

His memoirs, co-written with Erik Sherman, encompass his struggles with Steve Blass disease and his days as a color commentator for the Pirates.