|AD 27 by topic|
|Gregorian calendar||AD 27|
|Ab urbe condita||780|
|Balinese saka calendar||N/A|
|Chinese calendar||丙戌年 (Fire Dog)|
2723 or 2663
— to —
丁亥年 (Fire Pig)
2724 or 2664
|Coptic calendar||−257 – −256|
|- Vikram Samvat||83–84|
|- Shaka Samvat||N/A|
|- Kali Yuga||3127–3128|
|Iranian calendar||595 BP – 594 BP|
|Islamic calendar||613 BH – 612 BH|
|Julian calendar||AD 27|
|Minguo calendar||1885 before ROC|
|Seleucid era||338/339 AG|
|Thai solar calendar||569–570|
153 or −228 or −1000
— to —
154 or −227 or −999
AD 27 (XXVII) 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 Piso and Frugi (or, less frequently, year 780 Ab urbe condita). The denomination AD 27 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.
- Fire in Rome.
- A poorly built amphitheatre in Fidenae collapses, killing 20,000 of the 50,000 spectators.
- Using the dates and ranges listed in the Gospel of Luke, this year can be established as when John the Baptist begins preaching in the Jordan. It is also likely that Jesus was baptised by John in the final months of this year before his temptation and the first of three Passovers listed in the Gospel of John.
- An Arc of Triumph is erected in Rimini, in honor of the former Emperor Augustus.
- Herod Agrippa II, king of Judea
- Petronius, Roman writer and suffect consul (d. AD 66)
- Wang Chong, Chinese astronomer and philosopher (d. AD 100)