Niels Tygesøn Knagenhielm (also known as Niels Knag; 11 May 1661 – 19 May 1737) was a Norwegian civil servant, land owner and merchant. He is also known for his descriptions from Northern Norway. 
He was born near Vågsneset in the parish of Aure in Møre og Romsdal, Norway. He served as district stipendiary magistrate and bailiff in Finnmark. Along with Bergen merchant Jørgen Thormøhlen, he became involved with the lucrative trade in Finnmark and northern Russia. In 1688 appointed deputy judge of Stavanger. In 1695, he was appointed to Lagmann in Bergen. He lived at the Hop farm on the island of Askøy. In 1710 he also bought the farms at Kaupanger and Stedje parish in Sogndal and Losnegard on the island of Losna. He was knighted in 1721 with the surname Knagenhielm. He died in 1737 and was buried at St Mary's Church in Bergen.  
- Jon Gunnar Arntzen. "Knagenhjelm". Store norske leksikon. Retrieved July 15, 2016.
- "Hop, Askøy herad. Hordaland". Matrikkelutkastet av 1950. Retrieved July 15, 2016.
- Godal, Anne Marit (ed.). "Niels Tygesøn Knagenhielm". Store norske leksikon (in Norwegian). Oslo: Norsk nettleksikon. Retrieved 29 June 2012.
- Knagenhjelm, Wibeke. "Niels Knagenhielm". In Helle, Knut. Norsk biografisk leksikon (in Norwegian). Oslo: Kunnskapsforlaget. Retrieved 29 June 2012.
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