Tydal is a municipality in Sør-Trøndelag county, Norway. The administrative centre of the municipality is the village of Ås. Other villages include Østby, Gressli, Aunet, and Stugudalen. There is a school and a kindergarten in Tydal.

The approximately 850 inhabitants in Tydal earn a living in farming, forestry, energy production, and tourism. During Easter, the number of people in Tydal increases by up to 5,000 people. Many people from Trondheim celebrate their holidays in the 1,400 cabins located throughout the municipality of Tydal.

The municipality of Tydal was established on 1 January 1901 when it was separated from the large municipality of Selbu. The initial population of Tydal was 881. The municipal borders have not changed since then.

The municipality (originally the parish) is named after the Tya River. The first element of the name Tydal comes from the Old Norse: Þý, the old river name, which has no known meaning, and the last element (Old Norse: dalr) is means "valley" or "dale". The name was historically spelled Thidalen or Tydalen.

The coat-of-arms is from modern times; they were granted on 7 February 1997. It shows three gold Anthony's crosses on a red background. This was chosen to represent a power line and the letter T, representing the name of the municipality and the importance of hydroelectric power generation in Tydal.

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