Lionel Nallet (born 14 September 1976 in Bourg-en-Bresse, France) is a French rugby union player who currently plays at for Castres Olympique in the French Top 14 club competition and is the current captain of the France national team. He played for CS Bourgoin-Jallieu from 1998 to 2003 before moving to Castres.
Nallet made his international debut for France on 28 May 2000 in a test match against Romania at Bucharest's Dinamo Stadion. France won the match 67-20, with Nallet scoring a try on debut. He next played for his country the following year, in a match against England during the 2001 Six Nations Championship. Nallet made another five appearances for France that year, playing in test matches against the Springboks, All Blacks, Australia and Fiji.
In 2003 Nallet played in matches against Argentina and the All Blacks. However, he was not included in the squad for the 2003 Rugby World Cup in Australia or in 2004. He played four times for France during November 2005. He was a part of France's 2006 Six Nations Championship victory and was subsequently included in the national squad for the mid-year tests against Romania and the Springboks.
In 2008, following the retirement of Raphael Ibanez, he was named as captain of the French side.