Stephen George Ridzik (April 29, 1929 – January 8, 2008) was an American right-handed pitcher in Major League Baseball who played for five teams from 1950 to 1966, primarily the Philadelphia Phillies and Washington Senators.

Born in Yonkers, New York, Ridzik was signed by the Phillies at the age of 16 and made his major league debut on September 4, 1950, pitching in relief.

The Phillies traded him on April 30, 1955, along with Smoky Burgess and Stan Palys, to the Cincinnati Redlegs for Andy Seminick, Glen Gorbous, and Jim Greengrass.

After having his contract sold to Seattle of the Pacific Coast League that same year, the New York Giants claimed him the next month in the Rule 5 draft.

After life as a baseball player, Ridzik worked in the Washington, D.C. area for a military food distributor until moving to Florida in the late 1980s.