Marino Paul Pieretti (September 23, 1920 – January 30, 1981) was an Italian-born American professional baseball player.

He played in the major-leagues from 1945 through 1950 in the American League for the Washington Senators, Chicago White Sox, and Cleveland Indians.

Born in Lucca,[1][a] in Tuscany, Pieretti grew up in San Francisco's North Beach district.

[1] For his major-league career, he compiled a 30–38 win–loss record with an earned run average (ERA) of 4.53 in 673+2⁄3 innings pitched, allowing 713 hits and 321 bases on balls.

When he was stricken with cancer in the mid-1970s, his friends—many of them former baseball players from the Bay Area—organized "The Friends of Marino Pieretti" to buoy his spirits.