Millennium:	1st millennium BC
Centuries:	5th century BC - 4th century BC - 3rd century BC
Decades:	330s BC  320s BC  310s BC  - 300s BC -  290s BC  280s BC  270s BC
Years:	306 BC 305 BC 304 BC - 303 BC - 302 BC 301 BC 300 BC

303 BC by topic

Politics

State leaders - Sovereign states

Birth and death categories

Births - Deaths

Establishments and disestablishments categories

Establishments - Disestablishments v • d • e

303 BC in other calendars

Gregorian calendar	303 BC
Ab urbe condita	451
Armenian calendar	N/A
Bahá'í calendar	-2146 – -2145
Berber calendar	648
Buddhist calendar	242
Burmese calendar	-940
Byzantine calendar	5206 – 5207
Chinese calendar	[[Sexagenary cycle|]]年 (2334/2394) — to — [[Sexagenary cycle|]]年 (2335/2395)
Coptic calendar	-586 – -585
Ethiopian calendar	-310 – -309
Hebrew calendar	3458 – 3459
Hindu calendars
- Vikram Samvat	-247 – -246
- Shaka Samvat	N/A
- Kali Yuga	2799 – 2800
Holocene calendar	9698
Iranian calendar	924 BP – 923 BP
Islamic calendar	952 BH – 951 BH
Japanese calendar
Korean calendar	2031
Thai solar calendar	241
v • d • e

Events

By place

Seleucid Empire

• Seleucus I Nicator expands his kingdom throughout Persia as far east as India, but his advance is eventually halted by Chandragupta Maurya, the founder of the Maurya dynasty of India. In a pact concluded by the two leaders, Seleucus agrees to territorial concessions in exchange for 500 war-trained elephants .
• Seleucus refounds the town of Orrhoa in northern Mesopotamia as a military colony and mixes Greek settlers with its eastern population. He names Edessa in memory of the ancient capital of Macedon.

Greece

• Cassander and Lysimachus persuade Seleucus and Ptolemy to join them in trying to destroy Antigonus.
• Demetrius Poliorcetes occupies Corinth, Sicyon, and Argos in the Peloponnese, and Achaea, Elis and almost all of Arcadia join his side.

Italy

• The citizens of Tarentum seek the help of the Spartan general, Cleonymus. He is able to pacify the Lucanians with the agreement of the Romans.

Births

Deaths