Warren

Warren could mean:

Animal husbandry and related
Animal husbandry
 Warren (domestic), a rabbitry for the breeding and raising of domestic rabbits.  Warren is also used for rabbit or hare burrows in the wild.

Forest law
 Warren (free) ("Free warren"), a type of hunting franchise under the Anglo-Norman Forest law

Metaphor
 In metaphoric use, warren refers to a tight agglomeration of inferior accommodations, such as a slum.

People
 Warren G. Harding, 29th President of the United States
 Warren Beatty, American actor
 Warren Christopher, former Secretary of State of the United States
 Warren E. Burger, former Chief Justice of the Supreme Court
 Warren Buffett, American businessman and entrepreneur 
 Warren Hastings, first Governor-General of India
 Warren Zevon, American singer and musician
 Warren Truss, Australian politician

Other
 Warren abstract machine, a Prolog (software) engine
 Warren Commission, which investigated the assassination of John F. Kennedy
 Warren Cup, a Roman antiquity
 Warren's Gate, an archaeological site
 Warren's Skipper, a type of butterfly
 Warren Wagon Train Raid, historic incident in Texas