Petrograd Seimas (Lithuanian: Rusijos lietuvių seimas Petrograde or Visos Rusijos lietuvių seimas) was a conference of Lithuanian activists in Petrograd, Russian Republic, held on 9–16 June [O.S. 27 May – 3 June] 1917 to discuss the political future of Lithuania. Citing the right of self-determination, the delegates discussed whether Lithuania should seek autonomy or full independence. While it failed to unite Lithuanian activists, it helped to crystallize ideas on Lithuania's independence.