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Pope Stephen VI (died August 897) was Pope from May 22, 896 to August 897.

He had been made bishop of Anagni by Pope Formosus. The circumstances of his election are unclear, but he was sponsored by one of the powerful Roman families, the house of Spoleto, that contested the papacy at the time.

Stephen is chiefly remembered in connection with his conduct towards the remains of Pope Formosus, his last predecessor but one. Doubtless under pressure from the Spoleto contingent and fueled by Stephen's fury with his predecessor, the rotting corpse of Formosus was exhumed and put on trial, in the so-called Cadaver Synod (or Synodus Horrenda), in January 897. With the corpse propped up on a throne, a deacon was appointed to answer for the deceased pontiff, who was condemned for performing the functions of a bishop when he had been deposed and for receiving the pontificate while he was the bishop of Porto, among other revived charges that had been leveled against Formosus in the strife during the pontificate of John VIII. The corpse was found guilty, stripped of its sacred vestments, deprived of three fingers of its right hand (the blessing fingers), clad in the garb of a layman, and quickly buried; it was then re-exhumed and thrown in the Tiber. All ordinations performed by Formosus were annulled.

The trial excited a tumult. Though the instigators of the deed may actually have been Formosus' enemies of the House of Spoleto (notably Guy IV of Spoleto), who had recovered their authority in Rome at the beginning of 897 by renouncing their broader claims in central Italy, the scandal ended in Stephen's imprisonment and his death by strangling that summer.