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Trondheim (help·info) (Trondhjem) is a city and municipality in Sør-Trøndelag county, Norway. The city of Trondheim was established as a municipality on 1 January 1838 (see formannskapsdistrikt). The rural municipalities of Byneset, Leinstrand, Strinda, and Tiller were merged with Trondheim on 1 January 1964.

Trondheim is a Norwegian center of education, technical and medical research with the Norwegian University of Science and Technology (NTNU) and SINTEF located in the city. NTNU has about 25,000 students. With 168,257 inhabitants (as of January 1, 2009), Trondheim is Norway's third largest municipality, as well as the centre of the fourth largest urban area, with a population of approximately 152,800 (but the real number might be closer to 175,000 (uncertain as of 2008)). As of 2009, the Trondheim Region, a statistical metropolitan area, has a population of 225,847.

Trondheim was named Kaupangen (English: market place or trading place) by Viking King Olav Tryggvason in 997. Fairly soon, it came to be called Nidaros. In the beginning it was frequently used as a military retainer (Old Norse: "hird"-man) of King Olav. It was frequently used as the seat of the king, and was capital of Norway until 1217.

People have been living in the region for thousands of years as evidenced by the rock carvings in central Norway, the Nøstvet and Lihult cultures and the Corded Ware culture. In ancient times, the Kings of Norway were hailed at Øretinget in Trondheim, the place for the assembly of all free men by the mouth of the river Nidelva. Harald Fairhair (865–933) was hailed as the king here, as was his son, Haakon I – called 'the Good'. The battle of Kalvskinnet took place in Trondheim in 1179: King Sverre Sigurdsson and his Birkebeiner warriors were victorious against Erling Skakke (a rival to the throne). Some scholars believe that the famous Lewis chessmen, twelfth century chess pieces carved from walrus ivory found in the Hebrides and now at the British Museum, may have been made in Trondheim.

Trondheim was the seat of the (Catholic) Archdiocese of Nidaros for Norway from 1152. Due to the introduction of Lutheran Protestantism in 1537, the last Archbishop, Olav Engelbrektsson, had to flee from the city to the Netherlands, where he died in present-day Lier, Belgium.

The city has experienced several major fires. Since it was a city of log buildings, out of wood, most fires caused severe damage. Great fires ravaged the city in 1598, 1651, 1681, 1708, 1717 (two fires that year), 1742, 1788, 1841 and 1842. It must be noted that these were only the worst cases. The 1651 fire destroyed 90% of all buildings within the city limits. The fire in 1681 (the "Horneman Fire") led to an almost total reconstruction of the city, overseen by General Johan Caspar von Cicignon, originally from Luxembourg. Broad avenues like Munkegaten were created, with no regard for property rights, in order to stop the next fire. At the time, the city had a population of roughly 8000 inhabitants. After the Treaty of Roskilde on 26 February 1658, Trondheim and the rest of Trøndelag, became Swedish territory for a brief period, but the area was reconquered after 10 months. The conflict was finally settled by the Treaty of Copenhagen on 27 May 1660.

During World War II, Trondheim was occupied by Nazi Germany from 9 April 1940, the first day of the invasion of Norway, until the end of the war in Europe, 8 May 1945. The home of the most notorious Norwegian Gestapo agents, Henry Rinnan, it was also subject to harsh treatment by the occupying powers, including imposition of martial law in October 1942.