PT Bank Syariah Indonesia (Persero) Tbk (, abbreviated as BSI) is a state-owned Islamic bank in Indonesia. The bank was officially founded on 1 February 2021 as a result of merger between state-owned sharia banks.
Bank Syariah Indonesia has obtained the merger permit from the Financial Services Authority (OJK) dated 27 January 2021, using BRI Syariah as the surviving company. As of June 2024, BSI is the world's largest Islamic bank by customer numbers. BSI ATMs do not accept foreign cards.
BSI originated from three state-owned banks which are subsidiary of larger banks: BRIsyariah (of Bank Rakyat Indonesia/BRI), Bank Syariah Mandiri (of Bank Mandiri) and BNI Syariah (of Bank Negara Indonesia/BNI).
Before the establishment of its rival Bank Syariah Nasional (BSN) in October 2025, BSI were supposed to acquire another state-owned bank BTN Syariah, which was founded on 14 February 2005 as a sharia banking unit of Bank Tabungan Negara (BTN). But BTN instead was supposed to acquire Bank Muamalat Indonesia (BMI) and it would be finished in March 2024. , the acquisition plan of BMI by BTN was cancelled due to due diligence results. BTN then acquired 100% shares of Bank Victoria Syariah (BVIS) on 5 June 2025 as a step to facilitate the spin-off of the sharia banking unit into a BTN subsidiary.
On 22 December 2025, based on the results of the Extraordinary General Meeting of Shareholders (EGMS), due to the inclusion of Indonesian government' special rights of the Republic of Indonesia in the ownership of Series A Dwiwarna Shares in BSI, the corporate status of the bank changed from previously a subsidiary of Bank Mandiri to a state-owned enterprise in the form of a state-owned (Persero). Therefore, the official name of BSI was changed to PT Bank Syariah Indonesia (Persero) Tbk,and the change of legal status took effect on 23 January 2026.
As of 2024, BSI is Indonesia's sixth-biggest bank in terms of assets. BSI has been trying to expand its business in the Middle East, having opened a representative office in Dubai International Financial Center in early January 2022. The bank is planning to open a branch in Saudi Arabia.