Dollar is the name of more than 25 currencies. The United States dollar, named after the international currency known as the Spanish dollar, was established in 1792 and is the first so named that still survives. Others include the Australian dollar, Brunei dollar, Canadian dollar, Eastern Caribbean dollar, Hong Kong dollar, Jamaican dollar, Liberian dollar, Namibian dollar, New Taiwan dollar, New Zealand dollar, Singapore dollar, Trinidad and Tobago Dollar and several others. The symbol for most of those currencies is the dollar sign $ in the same way as many countries using peso currencies. The name "dollar" originates from Bohemia and a 29 g silver-coin called the Joachimsthaler.

The Eastern Caribbean dollar is the currency of all seven full members and one associate member of the Organisation of Eastern Caribbean States (OECS). The successor to the British West Indies dollar, it has existed since 1965, and it is normally abbreviated with the dollar sign $ or, alternatively, EC$ to distinguish it from other dollar-denominated currencies. The EC$ is subdivided into 100 cents. It has been pegged to the United States dollar since 7 July 1976, at the exchange rate of US$1 = EC$2.70.