The Rigsdag (Danish: Rigsdagen [ˈʁisˌd̥æˀən]) was the name of the national legislature of Denmark from 1849 to 1953.

It was a bicameral legislature, consisting of two houses, the Folketing and the Landsting.

In 1953, a new constitution was approved by referendum and adopted, with the result that the Rigsdag and the Landsting were eliminated in favor of a unicameral legislature under the name of the Folketing.

The Rigsdag, like today's Folketing, sat in Christiansborg Palace in the centre of Copenhagen.

Membership in the Rigsdag was limited to certain sectors of society – women were not allowed to join, and neither were about a quarter of all men over 30, mostly due to their condition as servants or welfare recipients.