Sigtrygg (Sigtryggr) is an Old Norse given name, composed of the elements sig "victory" and trygg "trusty, true". It is cognate with the Anglo-Saxon Sihtric.

In Norse-Gaelic Ireland (9th to 11th centuries) rendered as Sitric or Sihtric (the patronymic Sigtryggsson as mac Sitriuc).

The name is only rarely given in modern Scandinavian countries; it is mostly encountered in Iceland, in the form Sigtryggur, with 99 entries for the name in the Icelandic white pages as of 2013.^[1]

The names may refer to any of the following people:

• Sigtryggr, Sure of victory (Victory-true), one of the 99 names of Óðinn Alföðr ^[2]
• Sigtryg, the legendary father of Svipdagr, king of Norway, according to Gesta Danorum.
• Kings of Dublin:
  • Sigtrygg Ivarsson, 888–893
  • Sigtrygg Caech (Sigtrygg Gael), 917–921, king of York 921–927
  • Sigtrygg, 941–943
  • Sigtrygg Silkbeard Olafsson, 989–1036
• Sigtrygg Gnupasson, a 10th-century Danish king of the House of Olaf
• Sigtrygg of Nerike, a Swede who met Saint Olaf
• Sitric the Dane, an 11th-century ruler of Waterford
• Sitric mac Ualgairg, king of Breifne 1256/7
• Sigtryggur Baldursson, musician, best known as a member of the icelandic band The Sugarcubes

• Mac Sitric, Irish masculine surname
• Sitric Roads, Stoneybatter, County Dublin
• Irish people
• Norse people