George Francis Dillon (1836 – 29 January 1893) was a 19th-century Catholic missionary and writer from Ireland. He became well known in 1884 for having given conferences in Edinburgh about what he claimed to be a Masonic war against Christian civilisation. His speeches were later compiled with his best-known book, War of Anti-Christ with the Church and Christian Civilization. After being read a summary of this work, Pope Leo XIII approved it and funded the publication of an Italian version.