Sébastien Lefebvre MSC (born June 5, 1981) is a Canadian musician, who is best known as the rhythm guitarist and backing vocalist for the rock band Simple Plan.

In 2007, Lefebvre and Patrick Langlois from MusiquePlus created "Man of the Hour", a music podcast available on iTunes.

A music video was also released on YouTube,[1] directed by Simple Plan bandmate, Chuck Comeau.

In November 2010, Lefebvre and fellow Canadian musician Katie Rox released an EP entitled, Christmas Etc...[6] Lefebvre has accumulated a number of production and songwriting credits, including on Canadian singer-songwriter Andee's debut album Black and White Heart.

[8] Lefebvre has also produced Wilfred Le Bouthillier's fourth album, Je poursuis ma route[9] and self-produced a Simple Plan cover of No Use for a Name's song "Justified Black Eye" for the Tony Sly tribute album, The Songs of Tony Sly: A Tribute.