Henry Clay Hall, Jr. (January 3, 1860 – November 9, 1936) was an American attorney and commissioner of the Interstate Commerce Commission, appointed by president Woodrow Wilson in 1914 and who served on the Commission from March 21, 1914 to January 13, 1928. He served as Chairman of the Commission from 1917 to 1918 and again in 1924.
He was born on January 3, 1860 to Henry Clay Hall, Sr. and Amanda Harwood Ferry in New York City. Hall attended Amherst College and graduated in 1881, and received an LL.B. from Columbia Law School in 1883. He was admitted to the New York City Bar Association in 1883. After briefly practicing in New York, he moved to Paris, where he worked with his brother in law, Edmond Kelly, and in 1888, became counsel to the American Legation in Paris.
Hall returned to the United States in 1892 for health reasons. Hall planned to journey to California for his health but stopped off to visit a brother in Colorado Springs, Colorado, and found he liked the place so much that he settled there.
Hall resumed the practice of law in Colorado, becoming a major corporation lawyer and became mayor of Colorado Springs from 1905 to 1907. He became general attorney for the Arkansas, Louisiana & Gulf Railway and served as counsel for many corporations. He became President of the Bar in Colorado, and state vice-president of the American Bar Association.
In early 1914, Interstate Commerce Commission commissioner Charles A. Prouty resigned to take the job as head of the Commission's Division of Valuation, and to run for the Senate in Vermont. This, in combination with the death in November 1913 of commissioner John Hobart Marble of California following an attack of acute indigestion, gave President Woodrow Wilson two seats to fill on the Commission. Wilson selected Winthrop More Daniels of New Jersey to fill Marble's seat, and Hall to fill Prouty's. This preserved the geographic balance on the Commission.