Lionel Nallet (born 14 September 1976) is a former French rugby union player.

He began his professional career with CS Bourgoin-Jallieu, playing there from 1998 to 2003 before moving to Castres Olympique.

Nallet made his international debut for France on 28 May 2000 in a test match against Romania at Bucharest's Dinamo Stadium.

Nallet made another five appearances for France that year, playing in test matches against the South Africa, the New Zealand, Australia and Fiji.

On 30 April 2009, it was announced that Nallet had signed a 3-year contract with Racing Métro, who were promoted from the Pro D2 to the Top 14 after the club won the 2008–09 Championship.