Saint Thyrsus /ˈθɜːrsəs/ or Thyrse /ˈθɜːrs/ (Ancient Greek: Θύρσος, romanized: Thúrsos, literally "thyrsus"; Spanish and Portuguese: Tirso; French: Thyrse; died 251) is venerated as a Christian martyr.

He was killed for his faith in Apollonia, Phrygia, during the persecution of Decius, along with Leucius /ˈl(j)uːʃəs/ (Λεύκιος Leúkios) and Callinicus /ˌkælɪˈnaɪkəs/ (Καλλίνικος Kallínīkos).

Tradition states that Thyrsus endured many tortures and was sentenced to be sawn in half.

[1] Saint Leucius, after reproaching the governor, Cumbricius, was hanged, harrowed on his sides, and then beheaded.

Callinicus, a pagan priest, was converted after seeing the martyrdom of Thyrsus and was also beheaded.