|Centuries:||1st century – 2nd century – 3rd century|
|Decades:||90s 100s 110s – 120s – 130s 140s 150s|
|Years:||121 122 123 – 124 – 125 126 127|
|124 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||877|
|Bahá'í calendar||−1720 – −1719|
|English Regnal year||N/A|
|Chinese calendar||癸亥年 (Water Pig)
2820 or 2760
— to —
甲子年 (Wood Rat)
2821 or 2761
|Coptic calendar||−160 – −159|
|- Vikram Samvat||180–181|
|- Shaka Samvat||46–47|
|- Kali Yuga||3225–3226|
|Igbo calendar||−876 – −875|
|Iranian calendar||498 BP – 497 BP|
|Islamic calendar||513 BH – 512 BH|
|Minguo calendar||1788 before ROC
|Thai solar calendar||667|
|Wikimedia Commons has media related to 124.|
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.
- Emperor Hadrian begins to rebuild the Olympeion in Athens.
- Antinous becomes Hadrian's beloved companion on his journeys through the Roman Empire.
- During a voyage to Greece, Hadrian is initiated in the ancient rites known as the Eleusinian Mysteries.
- In northern India, Nahapana, king of the Scythians, is defeated and dies in battle while fighting against King Andhra Gautamiputra Satakarni. This defeat destroys the Scythian dynasty of Ksaharâtas.
- Nahapana, king of the Scythians
- Marcus Annius Verus (praetor), father of Marcus Aurelius
- Pope Sixtus I (approximate date) (b. 42 AD)