In World of Warcraft what lvl do you have to be to raid

That depends on the kind of raid you wish to enter. The old-world raids like Molten Core, Blackwing Lair and AQ20/AQ40 require you to be level 60. Raids in Outland such as Serpentshrine Cavern, Sunwell Plateau and Gruul's Lair require level 70.

All Northrend raids, such as Naxxramas, Ulduar and Icecrown Citadel require level 80.