The Archdiocese of Split-Makarska is a Latin Metropolitan archdiocese of the Catholic church in Croatia and Montenegro. The diocese was established in the 3rd century AD and was made an archdiocese and metropolitan see in the 10th century. The modern diocese was erected in 1828, when the historical archdiocese of Salona was combined with the Diocese of Makarska. It was elevated as an archdiocese and metropolitan see in 1969, restoring the earlier status of the archdiocese of Split, as it is also known. The diocese was also known as Spalato-Macarsca.

Salona was an ancient city and the capital of the Roman province of Dalmatia. Salona is located in the modern town of Solin, next to Split, in Croatia.