The Security Service of Ukraine (Ukrainian: Служба Безпеки України (СБУ); Sluzhba Bezpeky Ukrayiny (SBU)) is Ukraine's special-purpose law-enforcement agency and main government security agency in the areas of counterintelligence activity and of combatting terrorism.

The SBU has only appeared in S.T.A.L.K.E.R.: Call of Pripyat. The protagonist, Major Alexander Degtyarev, is a SBU agent sent into the Zone (disguised as a stalker) to investigate the failure of Operation Fairway.

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