Mårten Hagström (born 27 April 1971) is a Swedish musician, best known as the rhythm guitarist for the extreme metal band Meshuggah. He joined the band after the release of their first album, which allowed Jens Kidman to focus on his vocal performances and give up rhythm guitar duties. He and fellow Meshuggah guitarist Fredrik Thordendal are known for their complex rhythm guitar playing. Hagström has cited Rush, James Hetfield, Squarepusher, Autechre, Strapping Young Lad, and GISM as influences.

In a Metal Injection interview he has said, "You can't play an instrument for the technicality of it. It's a tool you use to get what's in here and here [heart and mind] out there." He has also stated that when he first started learning guitar, the prevailing trend was for increasingly virtuosic lead playing, and that he decided to focus on developing his intricate rhythm guitar style instead.

Although Thordendal plays most of Meshuggah's guitar solos, the two of them share songwriting duties more or less equally, with Hagström notably contributing "Nebulous" from Nothing, "Acrid Placidity" from Destroy Erase Improve, and "Neurotica" from Chaosphere. Hagström has also stepped out of his role of playing exclusively rhythm guitar with the release of Meshuggah's obZen album by playing the slower, melodic leads on the songs that he wrote, such as "Electric Red" and "Pravus".

In addition to this, he has contributed lyrics to some of the band's later releases, co-writing Catch 33 with Meshuggah drummer Tomas Haake and penning the entirety of the words for their abstract EP I. Hagström and Haake have been playing music together since they were nine years old.

Hagström, along with Thordendal, was rated #35 by Guitar World in their top 100 of the greatest heavy metal guitarists of all time.