Commonwealth Day 2025. Commonwealth day, held every year on the second monday of march, is a celebration of unity, diversity and the links of the modern commonwealth. Organised by the royal commonwealth society, the annual commonwealth service provides an opportunity to focus attention on this voluntary association of 56 countries and their.

The commonwealth is a diverse and vibrant family of nations spanning the globe, united by shared values and a commitment to democracy, justice, and prosperity for all. Commonwealth day is an annual moveable holiday that falls regularly on the second monday in march, and which takes place on march 10 this year.