William Jones (1859 – 9 May 1915) was a British Liberal Party politician.
Jones was born in 1859 the son of W. Jones, a peasant farmer. He was educated first at the British school at Llangefni, later becoming the pupil-teacher there. He continued his education at Bangor Normal College, the University College of Wales, Aberystwith and finally at Oxford University. He became a country schoolmaster, then an Assistant Master at Anglesey, Cardiganshire and then under the London School Board, and afterwards he worked as a private tutor at Oxford.
Jones entered the House of Commons as Liberal MP for Arfon in the 1895 general election;
He was re-elected unopposed in 1900 and in 1906;
In parliament he supported the 1908 Women's Enfranchisement Bill. He was re-elected at the January 1910;
He was elected unopposed at the December 1910 election. In 1911 was appointed to the Liberal administration of H. H. Asquith as a government whip. He died in office in May 1915.