Sir William Lowther, 1st Baronet (4 January 1676 – 6 April 1705) was an English landowner from Marske-by-the-Sea, Yorkshire. He was the eldest son of Anthony Lowther and Margaret Penn, daughter of Sir William Penn.
On 15 June 1697, he was created a baronet.
He married Catherine Preston and had three children: Sir Thomas Lowther, 2nd Baronet (1699–1745) Catherine Lowther Margaret Lowther
References Burke, John, and Bernard Burke. A Genealogical and Heraldic History of the Extinct and Dormant Baronetcies of England, Ireland, and Scotland. Baltimore: Genealogical Pub. Co, 1977.googlebooks.com Retrieved 3 November 2007 Lowther pedigree 1