Don Carlos Patrick Ragan (November 15, 1883 – September 4, 1956) was an American professional baseball pitcher. He played in Major League Baseball (MLB) during 11 seasons from 1909 to 1923 for seven different teams, primarily the Brooklyn Dodgers / Robins and Boston Braves.
On October 5, 1914, Ragan became the second National League pitcher and the third pitcher in major-league history to throw an immaculate inning, striking out all three batters on nine total pitches in the eighth inning of a game against the Boston Braves.