|Millennium:||1st millennium BC|
|328 BC by topic|
|Gregorian calendar||328 BC|
|Ab urbe condita||426|
|Ancient Egypt era||XXXII dynasty, 5|
|- Pharaoh||Alexander the Great, 5|
|Ancient Greek era||113th Olympiad (victor)¹|
|Balinese saka calendar||N/A|
|Chinese calendar||壬辰年 (Water Dragon)|
2369 or 2309
— to —
癸巳年 (Water Snake)
2370 or 2310
|Coptic calendar||−611 – −610|
|Ethiopian calendar||−335 – −334|
|- Vikram Samvat||−271 – −270|
|- Shaka Samvat||N/A|
|- Kali Yuga||2773–2774|
|Iranian calendar||949 BP – 948 BP|
|Islamic calendar||978 BH – 977 BH|
|Minguo calendar||2239 before ROC|
|Thai solar calendar||215–216|
−201 or −582 or −1354
— to —
−200 or −581 or −1353
Year 328 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Consulship of Proculus and Scapula or Decianus and Barbatus (or, less frequently, year 426 Ab urbe condita). The denomination 328 BC 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.
- At Maracanda, Alexander murders Cleitus, one of his most trusted commanders, friend and foster-brother, in a drunken quarrel; but his excessive display of remorse leads the army to pass a decree convicting Cleitus posthumously of treason.
- Spitamenes raises all Sogdiana in revolt behind him, bringing in the Massagetae, a people of the Scythian confederacy. He besieges the Macedonian garrison in Maracanda. Alexander the Great sends an army under the command of Pharnuches of Lycia which is promptly annihilated with a loss of more than 2,000 infantry and 300 cavalry.
- Understanding now the danger represented by his enemy, Alexander moves personally to relieve Maracanda, only to learn that Spitamenes has left Sogdiana. Spitamenes then attacks Bactra, from where he is repulsed with great difficulty by the satrap of Bactria, Artabazus of Phrygia.
- Alexander attacks Oxyartes and the remaining Bactrian barons who are holding out in the hills of Paraetacene (modern Tajikistan). The Macedonians seize the crag on which Oxyartes has his stronghold (the Sogdian Rock), and among the captives is his daughter, Roxana. In the reconciliation that follows the battle, Alexander marries Roxana. The rest of Oxyartes' opponents are either won over or crushed.
- December – Spitamenes is badly defeated by Alexander's general Coenus. At this point Spitamenes' allies, feeling the situation desperate, kill their leader and send his head as a gift to Alexander.
- Cleitus, lieutenant and friend of Alexander the Great (b. c. 375 BC)
- Spitamenes, Persian nobleman (b. 370 BC)