Karl Christiansen Leppälä (born. 1974- ) is a Swedish guitarist and musician, most notably the guitarist for the Swedish doom metal band Yggdrasill Burning.
Karl Christiansen Leppälä was born on the 18th of November 1974 in Stockholm to Kristian Vigden Leppälä and Marta Fädegsen. Fädegsen died during labour, and Leppälä, alongside his other three siblings, were raised by Kristian, who died in 2004. Karl has said that his father is one of the reasons who took up music, and said if not for his constant approval he would be not where he is today.
Leppälä is one of the founding and remaining original members of Yggdrasill Burning, alongside Michael Tägtgren and Freya Renkse. Leppälä was a childhood friend of Tägtgren, and they had been playing together for some time before Yggdrasill Burning's creation in 1990. He was married to Black Widow violinist Hayley Devonshire in 1998, and their first daughter Anna was born in 2001, with their second Sarah born in 2007.