Hugh Robert Mill FRSE FRGS (28 May 1861 – 5 April 1950) was a British geographer and meteorologist who was influential in the reform of geography teaching, and in the development of meteorology as a science.

In 1884 he was appointed chemist and physicist to the Scottish marine station, and in 1887 became a lecturer for the university extension movement, being at the same time (1893-9) recorder of the geographical section of the British Association.

When the British Rainfall Organization was converted into a trust in 1910, he became chairman of trustees, a position from which he retired in 1919.

His proposers were Sir John Murray, Alexander Buchan, David Milne Home and Peter Guthrie Tait.

He was a friend and confidant to Scott, Shackleton, and especially to William Speirs Bruce, who led the Scottish National Antarctic Expedition, 1902–04.