Canberra Day is a public holiday held annually on the second Monday in March in the Australian Capital Territory (ACT) to celebrate the official naming of Canberra. Canberra was named at a ceremony on 12 March 1913 by Lady Denman, the wife of the then Governor-General Lord Denman. The name 'Canberra' was officially proclaimed as the name of Australia's capital city on that day, and the event has been commemorated as Canberra Day ever since.

The day is marked with celebrations, events, and activities, all aimed at emphasising the city's unique attributes and its significance as the centre of the Australian government. Historically, the day has been associated with community celebrations and charity events with many taking to Lake Burley Griffin for activities and picnics. In addition, there are often concerts and exhibitions making it a festive period for residents and visitors alike.

Although it is a localised holiday only observed within the ACT, Canberra Day is a significant part of Australia's national identity. It represents not only a momentous event in the country's history but also serves as a celebration of the progress, heritage, and distinct culture of Australia's capital city. As Canberra is home to many national institutions and landmarks, Canberra Day is a reminder of its central role in the governance and identity of Australia.