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| Centuries: | 3rd century · 4th century · 5th century |
| Decades: | 270s 280s 290s 300s 310s 320s 330s |
| Years: | 300 301 302 303 304 305 306 |
| 303 by topic | |
| Politics | |
| State leaders - Sovereign states | |
| Birth and death categories | |
| Births - Deaths | |
| Establishment and disestablishment categories | |
| Establishments - Disestablishments | |
| Gregorian calendar | 303 CCCIII |
| Ab urbe condita | 1056 |
| Armenian calendar | N/A |
| Bahá'í calendar | -1541 – -1540 |
| Berber calendar | 1253 |
| Buddhist calendar | 847 |
| Burmese calendar | -335 |
| Byzantine calendar | 5811 – 5812 |
| Chinese calendar | 壬戌年十一月廿七日 (2939/2999-11-27) — to —
癸亥年十二月初七日(2940/3000-12-7) |
| Coptic calendar | 19 – 20 |
| Ethiopian calendar | 295 – 296 |
| Hebrew calendar | 4063 – 4064 |
| Hindu calendars | |
| - Vikram Samvat | 358 – 359 |
| - Shaka Samvat | 225 – 226 |
| - Kali Yuga | 3404 – 3405 |
| Holocene calendar | 10303 |
| Iranian calendar | 319 BP – 318 BP |
| Islamic calendar | 329 BH – 328 BH |
| Japanese calendar | |
| Korean calendar | 2636 |
| Thai solar calendar | 846 |
Events
By Place
Roman Empire
- Persuaded by Galerius, Diocletian launches the last major persecution of Christians in the Empire; Hierocles is said to have been the instigator of the fierce persecution of the Christians under Galerius.
- February 24 — Galerius publishes his edict that begins the persecution of Christians in his portion of the Empire.
- September 25 — On a voyage preaching the gospel, Saint Fermin of Pamplona is beheaded in Amiens, France.
- The Augusti and the Caesars are united for the first time to celebrate the 20th anniversary of the accession of Diocletian.
- The Triumphal Arch of Maximian is erected in Salonica.
Asia
- Sassanid Shah Hormizd II succeeds Narseh.
The Americas
- In Mexico the civilization of Teotihuacan flourishes.
By Topic
Religion
Births
- Magnentius, Roman usurper
- Wang Xizhi, Chinese calligrapher
Deaths
- April 23 — Saint George, soldier of the Roman Empire
- Acacius of Byzantium, Cappadocian, centurion in the imperial army, martyr
- Romanus of Caesarea, martyr
- Cessianus, Roman Catholic saint and martyr
- Crescentinus, patron saint of Urbino
- Saint Cyriacus
- Expeditus, Roman commander and martyr
- Erasmus of Formiae
- Cáo Huàn, last emperor of the Kingdom of Wei
- Lu Ji, Chinese writer and literary critic
- Victor Maurus, Christian martyr
- Adrian of Nicomedia, Christian saint
- Anthimus of Rome
- Vitus, Christian saint from Sicily
