Andronikos Doukas, Latinized as Andronicus Ducas, (Greek: Ανδρόνικος Δούκας; died 14 October 1077) was a protovestiarios and protoproedros of the Byzantine Empire.
Andronikos Doukas was son of the Caesar John Doukas and Eirene Pegonitissa. His father was a brother of Emperor Constantine X Doukas. His maternal grandfather was Niketas Pegonites. Andronikos himself was a first cousin of Michael VII Doukas.
In 1071 Andronikos was the commander of a section of the Byzantine army in the campaign of Romanos IV Diogenes against the Seljuk Turks of Alp Arslan. Commanding the rearguard of the army during the Battle of Manzikert, Andronikos announced that the emperor had been cut down and deserted from the battlefield. He was widely blamed for causing the crushing defeat of the Byzantine forces and the subsequent capture of Romanos IV by the enemy.
In 1072, after Romanos had been released by Alp Arslan, Andronikos and his brother Constantine were sent out by Michael VII and their father the Caesar John to intercept him. They defeated Romanos and hunted him down in Cilicia. It was Andronikos who finally obtained Romanos' surrender and conducted him towards Constantinople. In spite of his former hatred for the deposed emperor, Andronikos is said to have opposed his blinding on 29 June 1072.
In an act of 1073, he is recorded with his titles as protoproedros, protovestiarios and megas domestikos, which Michael Attaleiates clarifies as being the post of domestikos ton scholon of the East, which he had been given when sent against Diogenes.
In 1074, together with his father, Andronikos commanded the imperial army against the rebel mercenaries led by Roussel de Bailleul. Both were captured by the rebels, who released the badly wounded Andronikos to allow him to seek proper medical treatment in Constantinople. There he recovered for a few years, but in October 1077 died of an edema.
Andronikos Doukas married Maria of Bulgaria, daughter of Troian, a son of Emperor Ivan Vladislav of Bulgaria. They had at least five children:
- Michael Doukas, protostrator.
- John Doukas, megas doux.
- Irene Doukaina, who married Emperor Alexios I Komnenos.
- Anna Doukaina, who married George Palaiologos.
- Theodora Doukaina, a nun.