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Year 32 BC was either a common year starting on Monday or Tuesday or a leap year starting on Sunday, Monday or Tuesday (link will display the full calendar) of the Julian calendar (the sources differ, see leap year error for further information) and a common year starting on Monday of the Proleptic Julian calendar. At the time, it was known as the Year of the Consulship of Ahenobarbus and Sosius (or, less frequently, year 722 Ab urbe condita). The denomination 32 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.
- Gnaeus Domitius Ahenobarbus and Gaius Sosius become Roman Consuls.
- Spring – Final War of the Roman Republic: Mark Antony transfers his headquarters from Samos to Athens; he assembles a fleet of 500 combat vessels and 300 transport ships, crewed by 150,000 men.
- Sparta under Caius Iulius Eurycles, whose father Antony had ordered to be executed for piracy, declares his support for Octavian. Lappa (modern Argyroupoli) in Attica and Kydonia in Crete revolt against Cleopatra.
- July – The Roman Senate declares war upon Mark Antony and Cleopatra VII. Octavian Caesar is proclaimed dux and the West: Gallic and Spanish provinces, Africa, Sicily and Sardinia swears an oath (sacramentum) of loyalty to him. In order to assure this oath, Octavian forces the high priest of the Vestal Virgins in Rome to hand over Antony's will, which give information over the Roman-conquered territories as kingdoms and plans to build a tomb in Alexandria for him and Cleopatra.
- Winter – Antony distributes garrisons along the west coast of Greece, stations the fleet at Actium and establishes his headquarters at Patrae.
- Zacynthus is held by Gaius Sosius, Methone (Messenia) by Bogud of the royal house of Mauretania, driven into exile by his brother Bocchus II.