265 BC

Millennium:	1st millennium BC
Centuries:	4th century BC – 3rd century BC – 2nd century BC
Decades:	290s BC 280s BC 270s BC – 260s BC – 250s BC 240s BC 230s BC
Years:	268 BC 267 BC 266 BC – 265 BC – 264 BC 263 BC 262 BC

265 BC by topic
Politics
State leaders – Sovereign states
Birth and death categories
Births – Deaths
Establishments and disestablishments categories
Establishments – Disestablishments

**265 BC in other calendars**
Gregorian calendar	265 BC
Ab urbe condita	489
Armenian calendar	N/A
Bahá'í calendar	-2108 – -2107
Bengali calendar	-857
Berber calendar	686
Buddhist calendar	280
Burmese calendar	-902
Byzantine calendar	5244 – 5245
Chinese calendar	[[Sexagenary cycle\|]]年 (2372/2432) — to — [[Sexagenary cycle\|]]年 (2373/2433)
Coptic calendar	-548 – -547
Ethiopian calendar	-272 – -271
Hebrew calendar	3496 – 3497
Hindu calendars
- Bikram Samwat	-208 – -207
- Shaka Samvat	N/A
- Kali Yuga	2837 – 2838
Holocene calendar	9736
Iranian calendar	886 BP – 885 BP
Islamic calendar	913 BH – 912 BH
Japanese calendar
Korean calendar	2069
Thai solar calendar	279

Events

Although the Egyptian fleet blockades the Saronic Gulf, the Macedonian King Antigonus II defeats the Spartans and kills the King of Sparta, Areus I near Corinth, after which he besieges Athens.
Acrotatus II succeeds his father Areus I as king of Sparta.

Hiero II threatens to renew his attack on the Mamertines. They appeal to Carthage and receive the support of a Carthaginian garrison. The Mamertines also appeal to the Romans who are also willing to help.

The Archimedes screw for raising water is devised by the Greek mathematician Archimedes, who is studying at Alexandria.