Isaak Benrubi (24 May 1876 in Thessaloniki – 1943 in Geneva) was a philosopher from the Ottoman city of Thessaloniki, he opposed the conventional character of the act of knowing in "subject" and "object" to the reality that is interested in both subject and object: "I can't exist without the universe, neither can the universe exist without me".
He decided to attend the CIC's meeting in Geneva only after learning that both Einstein and Bergson would also be attending.