Princess Isabelle of Salm-Salm, full German name: Isabelle Maria Rosa Katherina Antonia, Prinzessin zu Salm und Salm-Salm (13 February 1903, Potsdam, Kingdom of Prussia, Germany – 10 January 2009, Kevelaer, North Rhine-Westphalia, Germany) was a member of the House of Salm-Salm and an Princess of Salm-Salm by birth.
Through her marriage to Felix, Baron of Loë, Isabelle was also Baroness of Loë.