Year 430 (CDXXX) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Theodosius and Valentinianus (or, less frequently, year 1183 Ab urbe condita). The denomination 430 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.

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• Asclepigenia, Athenian philosopher and mystic (d. 485)
• Julius Nepos, Western Roman Emperor (d. 480)
• Marcia Euphemia, Roman Empress (approximate date)
• Sidonius Apollinaris, bishop and diplomat (approximate date)
• Syagrius, Roman official and son of Aegidius
• Victor Vitensis, African bishop (approximate date)
• Xiao Wu Di, emperor of the Liu Song Dynasty (d. 464)

• August 28 – Augustine of Hippo, bishop and theologian (b. 354)
• Abdas, bishop of Susa
• Saint Aurelius, bishop of Carthage (approximate date)
• Feng Ba, emperor of the Chinese state Northern Yan
• Flavius Felix, Roman consul
• Nilus of Sinai, bishop and saint (approximate date)
• Octar, Hunnic ruler (approximate date)
• Plutarch of Athens, Greek philosopher