"Babban Wasan" rikici ne na siyasa da diflomasiyya wanda ya kasance mafi yawan karni na 19 da farkon karni na 20 tsakanin Daular Burtaniya da Daular Rasha, kan Afganistan , Daular Tibet, da yankuna makwabta na Tsakiya da Kudancin Asiya.Hakanan yana da sakamako kai tsaye a Farisa daIndiya ta Burtaniya .Biritaniya na fargabar cewa Rasha za ta mamaye Indiya don kara yawan daular da Rasha ke ginawa.A sakamakon haka, an yi wani yanayi mai zurfi na rashin yarda da maganar yaƙi tsakanin manyan dauloli biyu na Turai.Biritaniya ta ba da fifiko don kare duk hanyoyin da za a bi zuwa Indiya, kuma "babban wasa" shi ne da farko yadda Burtaniya ta yi hakan.Wasu masana tarihi sun yi ittifakin cewa Rasha ba ta da wani shiri da ya shafi Indiya, kamar yadda Rashawa suka sha fada wa Birtaniya.Babban Wasan ya fara ne a ranar 12 ga Janairun 1830 lokacin da Lord Ellenborough, Shugaban Hukumar Kula da Kula da Lafiya taIndiya , ya ba Lord William Bentinck, Gwamna-Janar aiki, da kafa sabuwar hanyar kasuwanci zuwa Masarautar Bukhara.Biritaniya ta yi niyyar samun iko a kan Masarautar Afganistan kuma ta mai da shi kariyar kariya, kuma ta yi amfani da daular Usmaniyya , daular Farisa, da Khanate na Khiva, da Masarautar Bukhara a matsayin kasashe masu fakewa tsakanin daulolin biyu.