Bhutanese ngultrum is the official currency of the country of Bhutan.
Until 1789, the coins of the Cooch Behar mint circulated in Bhutan. Following this, Bhutan began issuing its own coins known as chetrum, mostly silver ½ rupees. Hammered silver and copper coins were the only types issued until 1929, when modern style silver ½ rupee coins were introduced, followed by bronze 1 paisa in 1931 (dated 1928). Nickel ½ rupee coins were introduced in 1950. While the Cooch Behar mint coins circulated alongside Bhutan's own coins, decimalization was introduced in 1957, when Bhutan's first issue of coins denominated in naya paisa. The 1966 issues were 25 naya paisa, 50 naya paisa and 1 rupee coins, struck in cupro-nickel.
While the Bhutanese government developed its economy in the early 1960s, monetization in 1968 led to the establishment of the Bank of Bhutan. As monetary reforms took place in 1974, the Ngultrum was officially introduced as 100 Chhetrum equal to 1 Ngultrum. The Ngultrum retained the peg to the Indian rupee at par, which the Bhutanese coins had maintained.
The Ministry of Finance issued the first banknotes in 1974 denominated Nu.1, Nu.5, Nu,10 and Nu.100. This followed by the establishment of the Royal Monetary Authority of Bhutan as the central bank of Bhutan in 1982, which took over the authority to issue banknotes in 1983, replacing the authority of the Ministry of Finance.