Commonwealth Day is a significant holiday celebrated in Tuvalu, a small island nation located in the Pacific Ocean. The holiday, observed on the second Monday in March, signifies Tuvalu's membership in the Commonwealth of Nations—an intergovernmental organization consisting of 54 independent member countries, most of which are former territories of the British Empire. This day is meant to promote understanding on global issues, international cooperation, and the work of Commonwealth organizations.

On Commonwealth Day in Tuvalu, various activities and events are held to commemorate the occasion. These typically involve cultural presentations, dance performances, and sports competitions. Flags of the Commonwealth are also prominently displayed, symbolizing unity and diversity. The event highlights the shared values and principles of Commonwealth members such as democracy, human rights, and the rule of law which Tuvalu staunchly supports and promotes.

Moreover, the celebration of Commonwealth Day draws attention to the strong bond of Tuvalu with other member countries. It encourages citizens to acknowledge their global connections, affirm their shared history, and reflect on their responsibilities towards the improvement of the world. Specially designated programs are also dedicated to young people of the Commonwealth, fostering a sense of belonging and inspiring them to contribute to the positive development of their country and the broader Commonwealth.