International Day for Biological Diversity 2021 is celebrated on May 22, every year. This day is acknowledged for the promotion and awareness of biodiversity matters and was declared by United Nation. The International Day for Biological Diversity is also known as World Biodiversity Day.

The theme of the year 2021 is "We're Part of the Solution". This slogan is chosen as an extension to last year theme, "Our solutions are in nature," which answered many sustainable development changes. Biodiversity is a global asset as the civilization is build upon it. Even though technological advances are at its peak, humans are still dependent upon ecosystem which they should never ignore. Also, biodiversity is the foundation for nature-based solutions for humanity, therefore, it should be our duty as humans to be responsible towards the environment and also save animals from going extinct.