ICGV Þór was the first patrol ship of the Icelandic Coast Guard.

She was built by Edwards Brothers at North Shields, England in 1899 as a steam trawler for Danish-Icelandic trade and fishing association in Geirseyri and later served as a research ship for Denmark.

[1] In 1920, Björgunarfélag Vestmannaeyja bought the ship for use in fishing control and rescue work.

[2] After paying for its operational cost for several years, the Icelandic government decided to buy the ship in 1926.

[5] Thor served as a Danish research vessel from 1903 to 1920, conducting hydrographical and oceanographical research in the North Atlantic and the Mediterranean and helped locate the spawning grounds of the Icelandic cod.