The 1903 Pittsburgh Pirates season was the 22nd year the Pittsburgh Pirates played in Major League Baseball. The club finished their season as National League champions, beating the second-place New York Giants by games. They went on to participate in the 1903 World Series, the first to be played between the champions of the National League and American League. The Pirates started off well, winning 3 of the first four games, but the Boston Americans won the last four straight to win the series five games to three. The Pirates set a record of 56 consecutive innings without allowing the opposing team to score a run, a record that still stands today.