Percy Herbert Mills, 1st Viscount Mills KBE, PC (4 January 1890 – 10 September 1968), known as Sir Percy Mills, Bt, between 1953 and 1957 and as The Lord Mills between 1957 and 1962, was a British industrialist, public servant and politician.
Mills was born at Thornaby on Tees and educated at Barnard Castle School.
During the Second World War Mills served as Controller-General of Machine Tools at the Ministry of Supply from 1940 to 1944. He earned Harold Macmillan's absolute confidence and was described by the Oxford Dictionary of National Biography as "one of the most politically influential industrialists of his time." He was knighted in the 1942 New Year Honours, and was appointed to the Order of the British Empire as a Knight Commander (KBE) in the 1946 Birthday Honours. He was created as a Baronet, of Alcester in the County of Warwick, in 1952 and was raised to the peerage as Baron Mills, of Studley in the County of Warwick, in January 1957. The same month newly appointed Prime Minister Macmillan made Mills Minister of Power, with a seat in the cabinet. He was sworn of the Privy Council at the same time. In October 1959 he became Paymaster-General, which he remained until October 1961, when he was made Minister without Portfolio. Following his departure from the Cabinet after the "Night of the Long Knives" he was made Viscount Mills, of Kensington in the County of London, in 1962.