Sébastien Jumel (born 20 December 1971) is a French politician and a member of the French Communist Party (PCF). Jumel was elected general councillor for the Canton of Dieppe-Ouest in 2002 following a by-election, and became a vice-president in the left-wing majority in the Seine-Maritime general council in 2004. In 2008, he was elected mayor of Dieppe by the first round with 55.5% of the vote against 40.7% for the opposition. One week later, he was elected general councillor for Dieppe-Ouest.