Eric Ruuth (24 October 1746 – 25 May 1820) was a Swedish nobleman and the owner of Marsvinsholm Castle.

With his coal mine he started the company that would eventually become Höganäs AB.

He was born on 24 October 1746 to Gustaf Ruuth of Finland (1697–1757) and Baroness Ebba Christina Siöbladh.

She was the daughter of Baron Carl Georg Siöblad, Lord of Marsvinsholm and Countess Beata Elisabeth Stenbock.

[citation needed] From 1782 to 1786 he made extensive renovations at Marsvinsholm Castle.