Þorrablót (Icelandic pronunciation: [ˈθɔrraˌplouːt]; transliterated as thorrablot) is an Icelandic midwinter festival, named for the month of Þorri of the historical Icelandic calendar (corresponding to mid January to mid February), and blót, literally meaning sacrifice.
The historical context is from the Orkneyinga saga, where Þorri ("Frost") is an early Finnish king, the son of Snær ("Snow"). Hversu Noregr byggðist in the Flateyjarbók states that the Kvens offered a yearly sacrifice to Þorri at mid-winter.
The modern festival arose in the second half of the 19th century, with the Romantic nationalism of the time, comparable to Burns night in Scotland. The first known celebration was reportedly organised by the association of Icelandic students in Copenhagen in 1873, and by other societies active in the Icelandic independence movement of the time (Iceland received a constitution in 1874, and was recognized as a kingdom in personal union with Denmark in 1918).
The Þorrablót is an evening with dinner where participants hold speeches and recite poems, originally to honour the Norse god Thor (Þórr), whose name is taken to be associated with Þorri. Calling the feast a blót (a sacramental feast held in honor of a god in Norse mythology) makes clear the reference to pre-Christian times, which many nationalists of the 19th century considered a golden age of Icelandic history.
The festival gained wide publicity in the 1960s. This was due to a Reykjavík restaurant, called Naustið, starting to offer a platter with a selection of foods that had previously been common in the Icelandic countryside, but had become rare by that time, in 1958. The food was arranged in slices on a wooden trough made in the likeness of old troughs on display in the National Museum of Iceland. The restaurant advertised this platter as Þorramatur, thereby linking it with the tradition of the Þorrablót. The idea was well received and the serving of Þorramatur has since become a defining feature of Þorrablót.
Today Þorrablót are common events among Icelanders everywhere and can be anything from an informal dinner with friends and family to large organised events with stage performances and an after-dinner dance. These large Þorrablót celebrations are usually arranged by membership associations, associations of Icelanders living abroad, and as regional festivals in the countryside. 
- "The Orkneyinga saga". orkneyjar.com. Retrieved December 1, 2019.
- "Flateyjarbók". heimskringla.no. Retrieved December 1, 2019.
- Ólafur Davíðsson in Íslenskar gátur, skemmtanir, víkivakar og þulur (1887–1903, Copenhagen: Bókmenntafélagið):
- "Þorrablót was begun by Icelandic students in Copenhagen, or at least they did hold a Þorrablót in 1873. I've heard it said that Dr. Bjorn Olsen presented the best performance with his poem "the cup of Thor". In 1880, the Archaeological Society of Reykjavik held a Þorrablót. [...] We drank remembrance to the gods, of Odin allfather, of Thor, of Freyr and Njord for the year-blessing"
- Þorrablótin eiga upptök sín að rekja til íslenskra stúdenta í Kaupmannahöfn, eða að minnsta kosti héldu þeir þorrablót 1873. Ég hef heyrt sagt, að doktor Björn Ólsen hafi gengist mest fyrir því og eftir hann er veislukvæðið, Full Þórs. 1880 mun Fornleifafélagið í Reykjavík hafa haldið þorrablót [...] Við samdrykkjuna á eftir var guðanna minnst, Óðins alföður, Þórs, Freys og Njarðar til ársældar [...]
- "Naustið Restaurant". visithusavik.com. Retrieved December 1, 2019.
- Thorrablot Promote Iceland