Simon Lajeunesse (born January 22, 1981) is a Canadian former professional ice hockey goaltender.
His play with the Moncton Wildcats attracted the attention of the Ottawa Senators, who selected him 48th overall in the 1999 NHL Entry Draft.
He played one further season in the Senators' system before being traded by Ottawa to the Florida Panthers for Joey Tetarenko on March 4, 2003.
The rest of his career was spent playing for the San Antonio Rampage of the AHL and several teams in the ECHL.
He finished his career with two seasons in the semi-pro Ligue Nord-Américaine de Hockey (LNAH) with Laval and St. George's before retiring in 2007 at the age of 26.