National Unity Day is observed annually in India on October 31. The day marks the birth anniversary of Sardar Vallabhbhai Patel. He was known as the Iron Man of India. Every year, Sardar Vallabhbhai Patel’s birth anniversary is celebrated as National Unity Day or Rashtriya Ekta Diwas. Observance of National Unity Day on October 31 was initiated by the Indian Government in 2014. Watch the video to know more.