SLE - Sierra Leonean Leone

The Bank of Sierra Leone (BSL) serves as the country's central monetary authority, responsible for issuing banknotes, formulating monetary policy, and supervising financial institutions. Established under the Bank of Sierra Leone Act 1963 and opened on August 4, 1964, the BSL took over currency functions from the West African Currency Board that had served British colonial territories. The central bank sets interest rates and manages foreign exchange reserves to promote price stability. When sending money to Sierra Leone, transfers convert at rates influenced by market conditions and remittance inflows.

The Leone was introduced on August 4, 1964, three years after Sierra Leone gained independence from Britain. It replaced the British West African pound at a rate of 2 Leones per pound (making 1 Leone equal to 10 shillings). At launch, one Leone was worth precisely half a pound sterling or US$1.40 — the currency held more value than the US dollar throughout the 1960s and 1970s. Decades of inflation eroded that strength dramatically, and by July 2022, the government redenominated the currency at a ratio of 1,000 old Leones (SLL) to 1 new Leone (SLE), stripping three zeros from the old notes.

The Leone's history mirrors Sierra Leone's turbulent path through civil war and economic instability. During the 1991–2002 conflict, banknote production shifted rapidly to higher denominations as inflation spiraled — the 10,000 Leone note appeared in 2004 after the 5,000 Leone proved insufficient for daily transactions. Following the 2022 redenomination, Thomas De La Rue (a British security printing company) produced new notes in denominations of Le 1, 2, 5, 10, and 20, with the higher values featuring updated security features. The banknotes display national figures including former President Joseph Saidu Momoh and cultural landmarks reflecting Sierra Leone's heritage.

The Leone uses Le as its standard abbreviation, placed before the amount (Le 5, Le 20). The name itself carries significance — it derives from Sierra Leone, which Portuguese explorers named Serra Leoa (Lion Mountains) in the 15th century after the lion-shaped mountains near modern Freetown. The subunit cent follows British colonial convention, dividing into 100 parts, though cent coins have fallen out of practical use due to their negligible value. The 2022 redenomination reintroduced cent-denominated coins (1, 5, 10, 25, 50 cents) alongside Leone coins, though smaller denominations rarely appear in daily transactions.