Ann Harriet Hughes (1852 - 25 April 1910) was a Welsh language novelist, under the pen-name Gwyneth Vaughan.
Ann Harriet Hughes was born at Talsarnau in Merionethshire, the daughter of a miller, and had a basic school education at Llandecwyn. In 1876 she married John Hughes Jones, a doctor in Clwt-y-bont, Caernarvon; they later dropped the "Jones" part of their surname. They lived in London and later in Treherbert and Clwt-y-bont. Left to bring up four children on her husband's death in 1902, she moved to Bangor, Gwynedd, and took up writing as a career.
Hughes completed three novels, and a left a fourth unfinished work. She also edited Welsh versions of three of the works of the Scottish evangelist Henry Drummond and wrote verse in Welsh. She edited the woman's page in the Welsh Weekly (1892), Yr Eryr (1894–95) Y Cymro (1906–07).
Ann Harriet Hughes died on 25 April 1910 at Pwllheli.She was buried in the graveyard of the Llanfihangel-y-traethau church.