Winthrop More Daniels (September 30, 1867 - January 3, 1944) was an American government official and university professor. A friend and onetime assistant of then-Professor Woodrow Wilson, President Wilson appointed Daniels, then a member of the New Jersey Board of Public Utilities to the Interstate Commerce Commission in 1914, and stood by him through a bitter confirmation battle in the Senate. He was a longime professor at Princeton University, where he was an assistant to Wilson before becoming a fellow professor, and at Yale University.
He was born in Dayton, Ohio, the son of Mary and Edwin Daniels. He attended Princeton University where he secured his bachelor's degree in 1888 and his master's degree two years later. He studied at the University of Leipzig in 1890, and taught for a year as an instructor at Wesleyan University from 1891–92.
In 1892, Daniels was appointed as assistant professor of political economy, and three years later became a full professor, a post he kept until he entered government service in 1911. He married Joan Robertson in 1898; the two would have a son, Robertson Balfour Daniels. A friend of Wilson's, Daniels joined with Wilson in training the Princeton debaters for their championship matches against Harvard University and Yale University.
On May 1, 1911, Daniels became a member of the New Jersey Board of Public Utilities, replacing Frank H. Sommer of Newark, New Jersey. While on the Commission, Daniels authored a rate case opinion involving the Passaic Gas Company, in which he added intangible value for goodwill to the physical value of the corporation. This was controversial, since regulated companies' rates were a percentage of their valuation.