The Diocese of Macedonia (Latin: Dioecesis Macedoniae; Greek: Διοίκησις Μακεδονίας) was a diocese of the later Roman Empire, forming part of the praetorian prefecture of Illyricum. Its administrative centre was Thessalonica.

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Diocese of Macedonia Dioecesis Macedoniae Διοίκησις Μακεδονίας
Diocese of the Roman Empire
306–7th century
Capital	Thessalonica
Historical era	Late Antiquity
• Reforms of Diocletian	306
• Thessalonica became the Prefecture's new capital city	379
• Slavic invasion of the Balkans	7th century
Today part of	Albania  Greece  North Macedonia  Bulgaria

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The diocese was formed, probably under Constantine I (r. 306–337), from the division of the Diocletianic Diocese of Moesia. It included the provinces of Macedonia Prima, Macedonia Salutaris, Thessalia, Epirus vetus, Epirus nova, Achaea, and Crete. Alongside Dacia and, until 379, Pannonia, it made up the Prefecture of Illyricum. In 379, Pannonia was detached and merged into the Praetorian prefecture of Italy and Thessaloniki became the Prefecture's new capital city instead of Sirmium.

• Macedonia (terminology)
• Macedonia (Roman province)
• Macedonia (theme)

• Notitia dignitatum, Pars Orientalis, III
• Joseph Roisman, Ian Worthington, A Companion to Ancient Macedonia,

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