| Honorific Prefix: | Saint |
| Sidronius | |
| Death Place: | Rome |
| Feast Day: | 8 September or 11 July |
Saint Sidronius (died) was a Roman martyr. His life is confused with a French saint of the same name. His feast date is 8 September or 11 July.
The village of Saint-Cydroine in the commune of Laroche-Saint-Cydroine near Sens in Yonne, France, is named after the saint.It is said that Sidronius was martyred here by the Romans, and a spring here with miraculous powers was a place of pilgrimage in the Middle Ages.The Saint Cydroine Church is an 11th- or 12th-century Romanesque church with an octagonal tower in the village dedicated to the saint.It was founded by the abbey of La Charité-sur-Loire.
The Monks of Ramsgate wrote in their Book of Saints (1921),
Sabine Baring-Gould (1834–1924) wrote in his Lives of the Saints (1897),
The hagiographer Alban Butler (1710–1773) wrote in his Lives of the Primitive Fathers, Martyrs, and Other Principal Saints, under April 9,