Tjeldsund (Northern Sami: Dielddanuorri) is a municipality in Nordland county, Norway. It is part of the traditional district of Ofoten. The administrative centre of the municipality is the village of Hol i Tjeldsund. Other important villages include Fjelldal, Myklebostad, and Ramsund. Norges Brannskole (Norway's education and training center for firemen) is situated in Fjelldal in the northeastern part of the municipality. Marinejegerkommandoen is based south of Ramsund.

The municipality of Tjeldsund was established on 1 January 1909 when it was separated from the municipality of Lødingen. Tjeldsund encompassed the eastern part of Lødingen prior to the division. Initially, Tjeldsund had a population of 1,404.

On 1 January 1964, the western part of the island of Tjeldøya (population: 297) was transferred to Tjeldsund. On the same date the unpopulated Ramnes area of Evenes was also transferred to Tjeldsund.

The municipality is named after the Tjeldsundet strait between the islands of Tjeldøya and Hinnøya. The first element is the (uncompounded) Old Norse name of Tjeldøya (Tjöld or Tjalda) and the last element is sund which means "strait" or "sound". The name of the island is probably derived from the word tjald which means "tent" or the similar word tjaldr which means "oystercatcher (Haematopus ostralegus)".

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