Sir Frederick Mills, 1st Baronet, DL (23 April 1865–22 December 1953) was a British iron and steel manufacturer and Conservative Party politician. He was a Member of Parliament (MP) from 1931 to 1945.
Mills was born in Sunderland. He was educated at Dr Robertson's Private Academy and Durham College of Science, both in Newcastle upon Tyne. He was apprenticed at Palmers of Jarrow and then became an official of the South Durham Steel Company at . In 1896 he was appointed works manager of the Glasgow Iron Company's steelworks at Wishaw and in 1900 he moved to the Ebbw Vale Steel Iron and Coal Company as a departmental manager. By 1910 he was managing director and in November 1919 he became chairman in succession to Sir Charles Allen. During the First World War he not only directed one of the most important steel companies in Britain, but was also largely responsible for raising the Monmouthshire battalions of the South Wales Borderers. During the peace negotiations he represented British interests on the Steel Commission. For these services he was created a baronet, of Ebbw Vale in the county of Monmouthshire, in the 1921 New Year Honours.