
Sébastien Lefebvre (born 5 June 1981) is a French Canadian musician, who is best known as the rhythm guitarist and backing vocalist for pop punk band Simple Plan. Lefebvre grew up in Laval, Québec, and used to work as a janitor at his old high school; Collège Beaubois in Pierrefonds, Quebec.
Lefebvre's surname is properly pronounced, among French speakers, "le-fave", but English speakers generally pronounce it "le-fevra". He has commented on the difference, without pronouncing the French, in his podcasts. On the DVD A Big Package for You, he pronounces it "le-fever" when he introduces himself; however the other band members can be observed smirking as he does so.