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Markus Hubertus Johannes Jansen (born 15 December 1978) is a Dutch guitarist, vocalist, and songwriter. A prominent figure in the symphonic metal subgenre, he is known for his work with the bands After Forever (1995–2002), Epica (2002–present), and MaYaN (2010–present).

In both After Forever and Epica, he has performed growled vocals, complementing the vocals of, respectively, Floor Jansen (no relation) and Simone Simons.