Sir Lynch Salusbury Cotton, 4th Baronet (c. 1705 – 14 August 1775) was a Member of Parliament (MP) for Denbighshire. He was the son of Sir Thomas Cotton and his wife Philadelphia Lynch. He was the younger brother of the 3rd Baronet, Robert Salusbury Cotton who predeceased him without issue in 1748 and whom he thereby succeeded as 4th Baronet. He married a distant cousin, Elizabeth Abigail Cotton. In December 1749 he replaced, unopposed, Sir Watkin Williams-Wynn as Knight of the Shire for Denbighshire, a seat he retained until 1774.