Niclas Engelin (born 27 December 1972) is a Swedish heavy metal guitarist for Engel, Drömriket, We Sell the Dead, and The Halo Effect.

He rejoined In Flames briefly in late 2006 and again in 2009, as Jesper had been struggling with personal issues but maintained he would return.

Mr Engelin is since 2012 endorsed by Gibson Guitar Corporation Drömriket, a project started by Engelin and drummer Magnus "Adde" Andreasson (Hardcore Superstar), together with vocalist Ralf Gyllenhammar (Mustasch) and Jonas Slättung (bass and vocals), released their self-titled debut album in May 2014.

In October 2021, it was announced that Engelin would reunite with former In Flames bandmates Jesper, Peter Iwers, and Daniel Svensson, along with Dark Tranquility vocalist Mikael Stanne, in a new project named The Halo Effect.

The guitarist himself has neither confirmed nor given any public announcement about his departure, with an exception of several statements between 2019 and 2021 that he is still in the band, but when he was asked the same question in 2022, Engelin refused to answer.