What's the viewing order of the Queen's Blade anime? I want to watch Queen's Blade but found too many titles in the franchise, so I do not know which one to watch. In what order should I watch it?
Watch them in the following order:  


Queen's Blade - Rurou No Senshi (The Exiled Virgin)  
Queen's Blade - Gyokuza wo Tsugu Mono (Inheritor of the Throne AKA The Evil Eye)  
Queen's Blade - Gyokuza wo Tsugu Mono Specials  
Queen's Blade -  Utsukushiki Toushitachi (Beautiful Warriors)  
Queen's Blade -  Beautiful Warriors OVA  
Queen's Blade - Premium Visual Book OVA    
Vanquished Queens OVA  
Queen's Blade -  Rebellion  
Queen's Blade - Grimoire (currently airing, alternative setting to Rurou No Senshi)


If you check MyAnimeList, under the related section, you can see sequels, adaptations and alternative settings.  

There is also a forum where your question has been discussed.