Rshtuni (Armenian: Ռշտունի, also spelled Rashduni, Rshdouni, Reshdouni, Rashdouni, Rachdouni, Rachdoni, Rshduni, and Rushdoony) was an old Armenian noble house which ruled the region of Rshtuniq who were purportedly descendants of Rusas I of Urartu.
The king ordered the extermination of the two families, but Savasp Artsruni and Tadjat Rshtuni survived.
The best-known member and the leading figure of the family in the early 7th century is Theodoros Rshtuni, marzban then prince of Armenia from 638 to 655, who had the difficult task of ensuring Armenia's survival between Byzantine and Arab ambitions.
Following the destruction of the Sassanid empire, the Muslim incursions into Armenia in 642 began.
The family becomes increasingly irrelevant following Theodoros' exile, becoming vassals of the Artsrunis and losing their hereditary land of Bznunik to the Mamikonians in 656.