April

• 9 April: A tripartite agreement is signed among Bangladesh, India and Pakistan regarding post-war humanitarian issues.

September

• 17 September: Bangladesh joins the United Nations
  United Nations
  The United Nations is an international organization whose stated aims are facilitating cooperation in international law, international security, economic development, social progress, human rights, and achievement of world peace...
  
  .
• 24 September: Sheikh Mujibur Rahman
  Sheikh Mujibur Rahman
  Sheikh Mujibur Rahman was a Bengali nationalist politician and the founder of Bangladesh. He headed the Awami League, served as the first President of Bangladesh and later became its Prime Minister. He headed the Awami League, served as the first President of Bangladesh and later became its...
  
   addresses the UN General Assembly in Bangla.