Guillaume Pepy (born 26 May 1958) is a high-ranking French civil servant, president of the SNCF, the French national rail authority.
He is also Chairman of Eurostar and Deputy-Chairman of the Keolis Group.
The President of the Republic Nicolas Sarkozy appointed him to run the state-owned enterprise on 27 February 2008 for a term of five years.
In his Letter of Engagement, the Head of State asked him to make the development and modernisation of the enterprise the priorities of his mandate and that SNCF should enter, body and soul, into the era of development and competition.
He was reconnected for a new term by François Hollande in 2013.