Jason L. Lambert (born September 23, 1977) is a retired American mixed martial artist.

At UFC 68, Lambert defeated veteran and former title challenger Renato "Babalu" Sobral in a stunning upset by second-round knockout.

[3][4] Lambert moved down to the Middleweight division, and fought Canadian Jason MacDonald at UFC 88: Breakthrough in Atlanta, Georgia, on September 6, 2008.

After the loss to MacDonald that marked his third straight defeat, the UFC has released Lambert from his contract, saying that he "needed to get more wins".

[6] In his first bout after his release from the UFC, Lambert lost a unanimous decision to Vladimir Matyushenko at Call to Arms I on May 16, 2009.

[9] He then fought twice in the C3 Fights promotion, defeating Dominic Brown and Wayne Cole by TKO and rear-naked choke submission respectively.