David Areianites or Arianites (Greek: Δαυίδ Ἀρ[ε]ιανίτης) was a high-ranking Byzantine commander of the early 11th century.
The origin of the surname is uncertain and different theories have been proposed ranging from various anthroponomastic and toponymic derivations of the Indo-European word arya to the name of a minor Illyrian tribe, the Arinistae/Armistae.
David is sometimes considered to be the first member of the Arianiti clan, which was active in late medieval Albania, but the connection can not be verified due to lack of sources.
In that year he was named by the Byzantine emperor Basil II as the doux of Thessalonica (or possibly, although this is not stated explicitly, domestikos ton scholon of the West) in succession to Nikephoros Ouranos, who was moved to the governorship of Antioch.
Basil II himself managed to capture several minor Bulgarian castles but all attempts to seize Kastoria remained futile.