Carlo Biotti (1901 – 10 December 1977) was an Italian judge, the President of the Court of Milan and a Magistrate of the Supreme Court of Cassation. His forced recusal from the case brought by the widow of Giuseppe Pinelli against the police commissioner Luigi Calabresi in 1971 became a cause célèbre. Biotti fought for years to clear his name and in November 1974 was completely exonerated by the Court of Florence. He died three years later at the age of 76. In the 2012 film Piazza Fontana: The Italian Conspiracy, the character of Carlo Biotti is played by Bob Marchese.