He was elected as a member of the first Lebanese delegation to the Paris Peace Conference that was formed on October 9, 1918, and was also appointed to the third Lebanese delegation formed in January 1920 under the chairmanship of Bishop Abdullah Khoury. The workmanship he demonstrated enabled him to make historical achievements on the level of the Lebanese national entity. Eddé urged the board of directors in Mount Lebanon – on the eve of the second delegation's departure, headed by Patriarch Elias Hoayek – to issue a decision demanding the recovery of territories taken from Lebanon. Émile Eddé signed memoranda and petitions in the framework of his activity within the third delegation, and faced the French current calling for Syrian federalism after the Faisal - Clemenceau agreement and the Zionists’ demands in a meeting attended by the third delegation under the chairmanship of Archbishop Abdullah Khoury and Weizmann, saying that Zionism aims to annex southern Lebanon up to the Litani to Palestine, which is rejected by the Lebanese people.