Martijn Spierenburg (born 30 January 1975) is a composer and arranger.

He was also the keyboard player for the Dutch symphonic metal band Within Temptation from 2001 to 2024.

In 2018, it was announced that he would be the composer for the musical "Nieuw Amsterdam", which describes the role of the Dutch during the emergence of the city of New York, back in the Golden Age.

[1] Spierenburg has written and arranged music for several (international) artists, TV series and games.

[2] Spierenburg co-wrote songs for various Within Temptation albums, including "Angels", "Memories", "Jillian (I'd Give My Heart)", "Our Solemn Hour", "The Cross", "Sinéad" and "Forgiven".