Lethal is an adjective meaning capable of causing death. In practice, it is commonly used when implying or referring to something that is particularly highly likely to cause death.

Lethal may also refer to:

Roach Killa is an award-winning Punjabi rapper of Pakistani origin raised in Canada.

Born in the Saharan city of Sabha, Libya to Pakistani parents, Roach Killa migrated with his family to Canada at the age of ten. ]. At 12, he developed an interest in urban music and particularly reggae, inspiring him to become a reggae artist.

Roach Killa started his career in 2004; when he featured in a Rishi Rich song titled Talkin. After the song released he began to feature in many singles including Overdose, Bomp, Jadoo and many others. In 2009, he started his own album titled Revolution which had many songs included like Yaara Dildaara, Hey Gal feat Apache Indian, Ghora feat Blitz, Hathyar feat Gippy Grewal and Killin DEM. In 2010, his collaboration with newcomer Garry Sandhu turned out to be a milestone for him, in the song Dil De De. Roach Killa's unique sound appealed to the public so much that Every major Artist was at his door step and Roach Killa delivering evertime with Super Hits like Romantic Jatt Miss Pooja, Heatbeat Geeta Zaildar, Huthiyar Gippy Grewal Kuri Mere Haan Di, Ferrari Laike, Mere Yaar and once again with Garry Sandhu, in Din Raat.

Lethal Bizzle, also known as Lethal Big Lips. (born Maxwell Ansah, 14 September 1984 in Walthamstow, London, England), is a Ghanaian British rapper. His songs are known to satirise modern gangsta rap; much of the humour comes from the adoption of hip-hop style and language. In December 2004, he released the single "Pow (Forward)", also known as "Forward Riddim" which was banned from airplay by some mainstream radio stations.^{[citation needed]} It entered the UK Singles Chart at number 11 in its first week on the chart in 2005, and it reached number one on the UK Dance Chart. He won a MOBO for "Pow (Forward)" as 'Best Single', and was nominated at the same awards as 'Best Newcomer'.

Earlier he was a part of the group More Fire Crew. In 2002, their track "Oi!" reached the Top 10 of the UK Singles Chart. In early July 2005, Lethal Bizzle appeared on stage at the final Live 8 concert in Edinburgh and was a part of the NME Rock N Roll Riot Tour in 2007.

He was number five in the NME Cool list 2007/2008 beating Amy Winehouse, Pete Doherty and Alex Turner.