The eighty-ninth cabinet of Bulgaria, also known as the Three-party coalition cabinet and the Stanishev Government, ruled from August 17, 2005, to July 27, 2009. The cabinet was formed with the coalition of the three leading at that time: BSP, NDSV and DPS, in order of their parliamentary representation. Their parliamentary representation also determined the number of cabinet appointments.

The Bulgarian Socialist Party, also known as The Centenarian, is a centre-left, social democratic political party in Bulgaria. The BSP is a member of the Socialist International, Party of European Socialists, and Progressive Alliance. Although founded in 1990 in its modern form, it traces its political heritage back to the founding of the BRSDP in 1891. It is also Bulgaria's largest party by membership numbers.