Martin "Marthus" Škaroupka (born 20 January 1981) is a Czech drummer, best known as a member of the British extreme metal band Cradle of Filth.

Also in 1997, Marthus filled in as touring drummer for Czech bands Monastery, Pluggulp, Inner Fear, Happy Death and Scharnhorst.

In the years following (1997–2000), Marthus played live not only with Happy Death and Inner Fear, but also appeared as a guest drummer on Melancholy Pessimism mini-tour (2000), a project of Root singer Jiří "Big Boss" Valter, BigBoss and in 1999 recording CD of project Entrails (where he met Root guitar player, Petr "Blackie" Hošek).

In the beginning of 2001, Marthus took played drums in Pandemia, setting out on a spring European tour, after which he left the band.

In October 2006, Marthus joined English extreme metal band Cradle of Filth, replacing Adrian Erlandsson.