Year 124 (CXXIV) was a leap year starting on Friday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Glabrio and Flaccus (or, less frequently, year 877 Ab urbe condita). The denomination 124 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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• Apuleius, Numidian novelist, writer, public speaker (approximate date)

• Marcus Annius Verus, father of Marcus Aurelius
• Nahapana, ruler of the Scythians (approximate date)
• Sixtus I, bishop of Rome according to Roman Catholic tradition (approximate date)