Decades: 370s BC 360s BC 350s BC 340s BC 330s BC - **320s BC** - 310s BC 300s BC 290s BC 280s BC 270s BC

330 BC 329 BC 328 BC 327 BC 326 BC - **325 BC** - 324 BC 323 BC 322 BC 321 BC 320 BC

- Pytheas of Massilia makes the first recorded visit by a Greek of the lands currently known as Britain (approximate date)