Sir Lewis Jones (13 February 1884 – 10 December 1968) was a British Liberal National Party politician. A former schoolmaster, Jones took up political work in 1910. He served with the Ministry of Munitions during World War I, and became secretary of the ministry's priority department. Jones died in 1968 at his home in Swansea, aged 84. He had been secretary of the South Wales Siemens Steel Association for 44 years.