William Lowther

• Appleby (UK Parliament constituency)
• Cumberland (UK Parliament constituency)
• Sir William Lowther, 1st Baronet, of Little Preston
• Sir William Lowther, 1st Baronet, of Marske
• Sir William Lowther, 1st Baronet, of Swillington
• Sir William Lowther, 2nd Baronet
• Sir William Lowther, 3rd Baronet
• William Lowther (1639–1705)
• William Lowther (1668–1694)
• William Lowther (MP for Appleby)
• William Lowther (died 1688)
• William Lowther (died c.1421)
• William Lowther (diplomat)
• William Lowther, 1st Earl of Lonsdale
• William Lowther, 2nd Earl of Lonsdale