The Martyrium Ignatii (Martyrdom of Ignatius) is an anonymous Christian text from the late antique period. It was written in Greek prose, most likely in the 2nd century CE, though some scholars propose a later date in the 4th century. The work is a hagiographical account detailing the arrest, journey to Rome, and execution of Ignatius of Antioch, an early Christian bishop and martyr.

The text presents itself as an eyewitness report by companions who traveled with Ignatius. Its primary purpose was to commemorate his death and promote his veneration as a saint. The narrative describes Ignatius’s arrest under the Roman Emperor Trajan, his transport to Rome under guard, and his eventual execution by wild beasts in the arena. It includes dramatic and devotional elements characteristic of early martyr stories, such as Ignatius's expressed desire for martyrdom and accounts of miracles involving his relics. The same anonymous author or tradition is also credited with composing the epistolary framework that accompanies the longer collection of letters attributed to Ignatius.

According to modern scholars, the Martyrium Ignatii is a foundational work in the development of Christian martyr literature and saintly biography. It provides the main narrative context for the influential letters of Ignatius. The text helped establish the cult of Saint Ignatius and shaped the early Christian ideal of martyrdom as a powerful witness of faith. Its significance for academics lies in its role in studying the formation of hagiography, the veneration of relics, and the historical memory of persecution in the early church, even though its precise historical accuracy is debated.