| Honorific Prefix: | Saint |
| Tanco | |
| Birth Place: | Scotland |
| Death Date: | 815 |
| Death Place: | Verden, Saxony |
| Venerated In: | Catholic Church |
| Feast Day: | 6 February or 15 February |
Saint Tanco (or Tancho, Tanchon, Tatta; died 815) was a Scottish abbot, bishop, and martyr in Germany. He is venerated as a saint in the Catholic Church, with his feast day on 6 February or 15 February depending on the liturgical calendar.
The monks of St Augustine's Abbey, Ramsgate, wrote in their Book of Saints (1921),
The hagiographer Alban Butler (1710–1773) wrote in his Lives of the Primitive Fathers, Martyrs, and Other Principal Saints, under February 16,
Aegedius Ranbeck wrote in his Saints of the Order of Saint Benedict (1896),