**Niklas Sundin** (sündinud 13. augustil 1974 Rootsis) on Dark Tranquility ja Laethora kitarrist. 

Ta kirjutas sõnad kahele esimesele Dark Tranquility ja In Flamesi albumile ning jätkas Anders Frideni kirjutatud sõnade tõlkimist rootsi keelest inglise keelde, kuni Anders õppis inglise keelt.

Sundin on Cabin Fever Media rajaja, mis muuhulgas tegeleb ka metal'i-ansamblitele kunstitööde valmistamisega. Ta kirjastas hiljuti raamatu iseseisvatest kunstiteostest ja visanditest. Ta on kujundanud albumikaasi sellistele ansamblitele nagu In Flames, Arch Enemy, Sentenced, Kryptos ja Fragments of Unbecoming, ning samuti ka enda ansamblitele.

Tema esitatud muusika salvestisi
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* (1989) Dark tranquillity – *Enfeebled Earth* (singel, *Septic Broiler* nime all väljastatud)
* (1991) Dark tranquillity – *Trail of Life Decayed* (demo)
* (1992) Dark tranquillity – *A Moonclad Reflection* (EP)
* (1993) Dark tranquillity – *Tranquillity (Demo Cassette) (sisaldab Trail of Life Decayed ja A Moonclad Reflection)*
* (1993) Dark tranquillity – ***Skydancer***
* (1995) Dark tranquillity – *Of Chaos and Eternal Night* (MCD)
* (1995) Dark tranquillity – ***The Gallery***
* (1996) Dark tranquillity – *Enter Suicidal Angels* (MCD)
* (1997) Dark tranquillity – ***The Mind's I***
* (1998) Dark tranquillity – *The World Domination* (VHS)
* (1999) Dark tranquillity – ***Projector***
* (2000) Dark tranquillity – *Skydancer/Of Chaos and Eternal Night* (teine väljalase)
* (2000) Dark tranquillity – ***Haven***
* (2002) Dark tranquillity – ***Damage Done***
* (2003) Dark tranquillity – *Live Damage* (DVD)
* (2004) Dark tranquillity – *Exposures - In Retrospect and Denial* (kogumik)
* (2004) Dark tranquillity – *Lost to Apathy* (EP)
* (2005) Dark tranquillity – ***Character***
* (2006) Sigh – ***Gallows Gallery*** (külaline, kitarrisoolo)
* (2007) Dark tranquillity – ***Fiction*** (väljastamata)
* (2007) Laethora – ***March of the parasite*** (väljastamata)

Albumi esikaaned
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...And oceans – A.M.G.O.D.  

Ablaze my sorrow – Anger, Hate, Fury  

Ajattara – ITSE  

Ajattara – Kuolema  

Ajattara – Tyhjyys  

Agregator – A Semmi Ágán  

Agregator – Szürkület  

Alas – Absolute purity  

Amethyst – Dea Noctilucae  

Amortis – Gift of tongues  

Andromeda – Extension Of The Wish  

Andromeda – Crescendo of thoughts  

Andromeda – Chimera  

Arch Enemy – Wages of sin  

Arch Enemy – Burning angel EP  

Arch Enemy – Anthems of rebellion  

Arch Enemy – Dead eyes see no future EP  

Arch Enemy – Live doomsday DVD  

Arise – The godly work of art  

Arise – Kings of the cloned generation  

Armageddon – Embrace The Mystery  

As Memory Dies – Transmutate  

Autumnblaze – DämmerElbenTragödie  

Autumnblaze – Words are not what they seem  

Callennish circle – Flesh power dominion  

Callennish circle – My passion // Your pain  

Callennish circle – Forbidden empathy  

Ceremonial oath – The lost name of God EP   

Charon – Tearstained  

Charon – Downhearted  

Charon – Little angel EP  

Corporation 187 – Perfection in pain  

Dark age – s/t  

Dark Tranquillity – Haven  

Dark Tranquillity – Projector  

Dark Tranquillity – Skydancer/Of Chaos And Eternal Night  

Dark Tranquillity – Haven  

Dark tranquillity – Damage done  

Dark tranquillity – Exposures  

Dark tranquillity – Lost to apathy  

Dark tranquillity – Character  

Dark tranquillity – Fiction  

Dawn of relic – Lovecraftian dark  

Deadsoil – Sacrifice  

Detonation – An epic defiance  

Detonation – Portals to Uphobia  

Dimension zero – Silent night fever  

Dimension zero – This is hell  

Dominion caligula – debut album  

Dragonland – Astronomy  

Dreamaker – Human device  

Empyrium – Weiland  

Enforsaken – The forever endeavour  

Enter chaos – Aura noir  

Enter my silence – Remotecontrolled scythe  

Entwine – Gone  

Entwine – New dawn (mcd)  

Eternal Tears Of Sorrow – Chaotic Beauty  

Eternal tears of sorrow – The virgin and the whore  

Eternal tears of sorrow – The last one for life (EP)  

Ethereal spawn – Ablaze in viral flames  

Eventide – Caress the abstract (mcd)  

Eventide – Promo 2000  

Eventide – No place darker  

Eventide – Diaries from the gallows  

Eyetrap – Folk magic  

Fields of Asphodel – Deathflower (mcd)  

Flowing tears – Jade  

Fragments of unbecoming – Sterling black icon  

Gaia – s/t  

Gardenian – Sindustries  

Gardenian – Soulburner  

Green Carnation – Journey to the end of the night  

Green Carnation – Light of day, day of darkness  

Green Carnation – The quiet offspring  

Harm – Devil  

Hypocrite – Edge Of Existence  

In Flames – The tokyo showdown  

In Flames – Reroute to remain  

In Flames – Trigger  

In Flames – Soundtrack to your escape  

In Flames – The quiet place  

Jeremy – Edge on the history  

Jeremy – The 2nd advent  

Kang in O – s/t  

Kayser – Frame The World...Hang On the Wall  

Kerozene – s/t  

Kryptos – Sprial ascent  

Lacrimas Produndere – Ave end  

Last tribe – The uncrowned  

Laethora – March of the parasite  

Lost Horizon – Awakening the world  

Love in the time of cholera – The sun through glass  

Luciferion – The apostate  

Lullacry – Be my god  

Madrigal – Enticed (ep)  

Madrigal – I die you soar  

Mercenary – 11 dreams  

Miscellany – s/t  

Mirrored mind – At meridian  

Moonsorrow – Suden udi  

Mourning caress – Escape  

My blood is fire – The end of innocence  

Mörk gryning – Maelstrom chaos  

Naglfar – Sheol  

Narcissus – Crave and collapse  

Nightrage – Sweet vengeance  

Novembre – Classica  

Opposite sides – Soul mechanics  

Passenger – s/t  

Passenger – In reverse (ep)  

Pathos – Katharsis  

Red aim – Niagara  

Rockateers – Louder than ever (ep)  

Sanctus – Aeon sky  

Samadhi – Incandescence  

Satanic slaughter – Banished to the underworld  

Scaar – The Second Incision  

Scylla – Mater dolorosa  

Sentenced – Crimson  

Sentenced – Killing me, killing you (ep)  

Shadownation – Promo 2001  

Silence – Enola  

Silence – The P/O/U/R letters  

Skyfall – s/t  

Sleeping X – Sleeping X (demo ep)  

Soultorn – Masks  

Spiritual beggars – Demons  

Sunset Sphere – Storm before silence  

Supreme majesty – Tales of a tragic kingdom  

Supreme majesty – Danger  

Tactile gemma – s/t  

The crest – Letters from fire  

The forsaken – Traces of the past  

The more I see – s/t  

Thundra – Blood of your soul  

Thyrane – Hypnotic  

Thyrfing – Vansinnesvisor  

Time requiem – The inner circle of reality  

Turisas – Battle metal  

Underthreat – Deathmosphere  

Urban tales – Signs of times  

Various artists – No fashion classics  

Veneficum – Enigma prognosis  

Vermin – Filthy f\*\*\*ing vermin  

Witchery – Symphony for the devil (USA versioon)  

Within Y – Extended mental dimensions  

Wolf – Wolf (german edition)  

Wolf – Moonshine (ep)

Välislingid
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* Dark Tranquillity
* Laethora
* Cabin Fever Media