"East Indiaman" was a generic name for any sailing ship belonging to any of the East India Companies (Danish, Dutch, English, French, Portuguese and Swedish) that traded in the East Indies (Southeast Asia) from the 17th to the 19th century.

Of a big size and with a huge cargo capacity, these ships were some of the largest merchant ships in the late 18th and early 19th centuries. The ships varied in size from about 400 to 1,500 tons and more; often they were larger than contemporary men-of-war. They were three-masted and invariably well armed for protection against piracy.