The Opsician Theme (Greek: θέμα Ὀψικίου, thema Opsikiou) or simply Opsikion (Greek: [θέμα] Ὀψίκιον, from Latin: Obsequium) was a Byzantine theme (a military-civilian province) located in northwestern Asia Minor (modern Turkey). Created from the imperial retinue army, the Opsikion was the largest and most prestigious of the early themes, being located closest to Constantinople. Involved in several revolts in the 8th century, it was split in three after ca. 750, and lost its former pre-eminence.