The USS Valiant (NCC-75418) was a Federation starship that was in service with Starfleet in the late 24th century. Valiant was assigned to Star Fleet Battle Group Omega in 2379.
In that year, the Valiant, along with Battle Group Omega, was redirected to sector 1045 to rendezvous with the USS Enterprise-E, which was returning from Romulan space with the Reman warbird Scimitar, under the command of Shinzon, in pursuit. The Enterprise was forced to face the Scimitar without the support of the fleet, however, when Shinzon ambushed the Enterprise in the Bassen Rift. (Star Trek Nemesis)