The Cyprus Convention of 4 June 1878 was a secret agreement reached between Great Britain and the Ottoman Empire which granted administrative control of Cyprus to Britain (see British Cyprus), in exchange for its support of the Ottomans during the Congress of Berlin. Provisions in the Convention retained Ottoman rights over the territory of Cyprus.

This agreement was the result of secret negotiations that took place earlier in 1878. The Convention was abrogated by the British on 5 November 1914, when Britain and the Ottoman Empire found themselves at war with each other.