23 is a year in the 1st century. It was a common year starting on Friday of the Julian calendar. At the time, it was known as the Year of the Consulship of Pollio and Vetus.
|Centuries:||1st century BC – 1st century – 2nd century|
|Decades:||0s BC 0s 10s – 20s – 30s 40s 50s|
|Years:||20 21 22 – 23 – 24 25 26|
|Gregorian calendar||AD 23|
|Ab urbe condita||776|
|Balinese saka calendar||N/A|
|Chinese calendar||壬午年 (Water Horse)|
2719 or 2659
— to —
癸未年 (Water Goat)
2720 or 2660
|Coptic calendar||−261 – −260|
|- Vikram Samvat||79–80|
|- Shaka Samvat||N/A|
|- Kali Yuga||3123–3124|
|Iranian calendar||599 BP – 598 BP|
|Islamic calendar||617 BH – 616 BH|
|Julian calendar||AD 23|
|Minguo calendar||1889 before ROC|
|Seleucid era||334/335 AG|
|Thai solar calendar||565–566|
149 or −232 or −1004
— to —
150 or −231 or −1003
- Strabo publishes Geography. It covers the world known to the Romans and Greeks at the time of Emperor Augustus.
- Aelius Sejanus gains power in the Roman Senate and Tiberius.
- Gaius Asinius Pollio, Gaius Antistius Vetus become consuls
- Liu Xuan proclaims himself emperor against Wang Mang.
- Battle of Kunyang - troops under Liu Xiu defeat 450,000 of Wang Mang's troops
- Pliny the Elder, Roman scientist and writer
- September 14 – Drusus Julius Caesar, son of the Emperor Tiberius, poisoned
- October 6 – Wang Mang, Emperor of the Xin Dynasty