The Convention of Constantinople is signed, guaranteeing free maritime passage through the Suez Canal during war and peace.

The Convention of Constantinople is a treaty concerning the use of the Suez Canal in the Ottoman ruled Khedivate of Egypt. It was signed on 29 October 1888 by the United Kingdom, the German Empire, Austria-Hungary, Spain, France, Italy, the Netherlands, the Russian Empire and the Ottoman Empire. The Khedivate of Egypt, through whose territory the Canal ran and to which all shares in the Suez Canal Company were due to revert when the company's 99-year lease to manage the canal expired, was not invited to participate in the negotiations and did not sign the treaty.