World Autism Awareness Day is an internationally recognized day that is celebrated on 2nd April every year. On this day, the United Nations encourages its member countries around the world to take various initiatives to raise awareness about people with autism spectrum disorder (ASD). The day was nominated by the UN General Assembly in accordance with Article 62/1999. The resolution "World Autism Awareness Day" was passed by the UN General Assembly on November 1, 2006 and adopted on December 16 of the same year. Shikha Mojah bint Nasser al-Misnad and his successor, Sheikh Hamad bin Khalifa al-Thani, emir of the state of Qatar, all member states supported their proposal.

The resolution was passed and adopted without a vote in the UN General Assembly. This was originally a step in the direction of previous UN initiatives to promote human rights. World Autism Day is one of the seven days of the United Nations. These are the days when all the different autism organizations around the world work together on issues such as research, diagnosis, treatment, and social acceptance of people with such mental disorders.

Dhanaidaha Haque Autistic & Buddhi Protibondhi Biddaloy has been observing this day through rallies and other activities.