"Sigtrygg" is a Norwegian name; in Ireland rendered as Sitric or Sihtric. The names may refer to any of the following people:
- Sitric the Dane, founder of Waterford
- Sigtrygg of Nerike, a Swede who met Saint Olaf
- Sigtrygg Gnupasson, a 10th century Danish king of the House of Olaf
Kings of Dublin:
- Sigtrygg Ivarsson, 888–893
- Sigtrygg Ivarsson, 894–896
- Sigtrygg Caech (Sigtrygg Gael), 917–921, king of York 921–927
- Sigtrygg, 941–943
- Sigtrygg Silkbeard Olafsson, 989–1036
Kings of Breifne:
- Sitric mac Ualgairg, 1256–1257
Sitric may also refer to:
- Sitric Roads, Stoneybatter, County Dublin