|countryimage_alt=A portrait of two men in 1970's suits.|caption=Carl Heath and Per Wetterstrand, organizers of OB7.|location=Varberg, Sweden
|name=OB7
|homepage_urldate=http://ob7.se{{start date|2002|10}}|homepage_link_textwebsite=OB7s web page{{URL|number_of_runs=1ob7.se}}|number_of_playersparticipants=36
|duration=2 days
|full_creditsdesigners=Designed by {{plainlist|*[[Carl Heath]] and * [[Per Wetterstrand]].}}|participation_fee={{currency|900|SEK 900}}|game_mechanicstechniques=Several{{plainlist|* [[The Doctor]]* [[Pre-larp workshop]]}}
}}
'''OB7''' was a larp set in the context a prison during political turmoil in Sweden in 1973. The Swedish Security Police (Swedish: ''Säpo'') arrested people belonging to various leftist organisations and kept them in prison for interrogation on the suspicion of terrorist activities. The game was designed to explore gameplay in isolation.
==Controversy==
OB7 was controversial when produced as it explored themes from the classical Stanford Prison Experiment[http://en.wikipedia.org/wiki/Stanford_prison_experiment]. It was a [[political larp]] which brought to light political controversies of the 1970s as well as then-current issues. OB7 was written in the wake of 9/11 and the European Union meeting summit in Göteborg 2001.