Nearchus (Greek: Νέαρχος, Nearchos; c. 360 – 300 BC) was one of the officers, a navarch, in the army of Alexander the Great. He is known for his celebrated voyage from the Indus river to the Persian Gulf following the Indian campaign of Alexander the Great, in 326–324 BC. An account of his voyage is given in Arrian's Indica, written in the 2nd century AD.
A native of Lato in Crete and son of Androtimus, his family settled at Amphipolis in Macedonia at some point during Philip II’s reign (we must assume after Philip took the city in 357 BC), at which point Nearchus was probably a young boy. He was almost certainly older than Alexander, as were Ptolemy, Erigyius, and the others of the ‘boyhood friends’; so depending on when Androtimus came to Macedonia Nearchus was quite possibly born in Crete.
Nearchus, along with Ptolemy, Erigyius and Laomedon, and Harpalus, was one of Alexander’s ‘mentors’ – and he was exiled by Philip as a result of the Pixodarus affair (A 3.6.5; P 10.4). It is not known where the exiles went, but they were recalled only after Philip’s death, on Alexander’s accession.
After their recall, these men were held in the highest honour. Nearchus was appointed as satrap of Lycia and Pamphylia in 334/3 BC (A 3.3.6), one of the earliest of Alexander's satrapal appointments. In 328 BC he was relieved of his post and rejoined Alexander in Bactria, bringing with him reinforcements (A 4.7.2; C 7.10.4, but does not mention Nearchus himself). After the siege of Aornus Nearchus was sent at the head of a reconnaissance mission – especially to find out about elephants (A 4.30.5–6).