Tartan Day is celebration of Scottish heritage and the cultural contributions of Scottish and Scottish-diaspora figures of history. The name refers to tartan, a patterned woollen cloth associated with Scotland. The event originated in Nova Scotia, Canada, in 1987.

Tartan Day is celebrated on 6 April each year and is a worldwide celebration of Scottish heritage. Communities around the world take part in Tartan Day, organising parades, ceilidhs, meetings and talks.

Tartan Day is celebrated on April 6th every year to commemorate the signing of the Declaration of Arbroath in 1320. This document was a letter sent by Scottish nobles to Pope John XXII, declaring Scotland's independence from England.

National Tartan Day is a US observance on April 6 each year. It commemorates the Scottish Declaration of Independence, from which the American Declaration of Independence was modeled on. It also recognizes achievements of Americans of Scottish descent.