Martina (Greek: Μαρτίνα; died after 641) was an empress of the Byzantine Empire, the second wife of her uncle the emperor Heraclius, and regent in 641 with her son.

[2] The emperor and the empress were, however, clearly a close couple: Martina accompanied her husband in his most difficult campaigns against the Sassanid Empire.

[2] However, other scholars advise caution against such a view, as her disappearance in coinage came at the same time as Heraclius' major monetary reform.

Because of Heraclonas' young age, Martina ruled through him, consistently opposing the policies of Constantine, leading to the creation of two different political factions.

When Heraclius Constantine died suddenly of tuberculosis only four months later, the common belief was that the empress poisoned him to leave Heraclonas as sole ruler.

Martina began immediately to exile the prominent supporters of Constantine and with the help of Patriarch Pyrrhus, one of her primary advisors, revived the policy of monothelitism.

The Armenian Valentinus with the troops from Asia Minor, marched to Chalcedon and a frightened Heraclonas named Constans II, son of late Constantine, a co-emperor.

[9] In November 641, their downfall was completed as the army marched on Constantinople and captured Martina and her three sons, Heraclonas, David and Marinos.

[10] Lynda Garland completed a comprehensive study of Byzantine empresses, covering Martina extensively.

She summarised that Empress Martina was a 'scapegoat' for the failure against Arab expansion as well as the continuation of her husband's policies of monothelitism.