Mary Dixon Kies (March 21, 1752 – 1837) was an American inventor. On May 5, 1809, her patent for a new technique of weaving straw with silk and thread to make hats was signed by President James Madison.

Some sources say she was the first woman to receive a US Patent, however other sources cite Hannah Slater in 1793, or Hazel Irwin, in 1808, as the first.