Muslims in some countries follow the same moon sighting and abide by the lunar calendar of Saudi Arabia, while other countries follow the authority in charge of ascertaining the sighting of the moon int heir own country.
Here are some of the pictures showing the many ways Muslims mark the occasion around the world.
A Muslim man grabs a goat to prepare it for a sacrifice during Eid al-Adha festival, in Xining, Qinghai province, China, September 24, 2015
A sacrificial bull decorated for sale stands at its feed trough at the animal market on the outskirts of Islamabad, Pakistan.
A sheep is pushed off a truck at a sheep market two days ahead of Eid al-Adha, in Port Bouet, Abidjan, Ivory Coast.
A trader sleeps amid his goats at a livestock market on the eve of the Eid al-Adha festival in Kolkata, India.
Traders wait for customers at a livestock market ahead of the Eid al-Adha festival in the old quarters of Delhi, India.
Muslims attend an Eid al-Adha mass prayer on a street next to the Dongguan Great Mosque, in Xining, Qinghai province, China, September 24, 2015.
Muslims attend an Eid al-Adha (Kurban Bairam) mass prayer in Moscow, Russia, September 24, 2015.
A vendor talks with customers at a livestock market ahead of the Eid al-Adha in Kabul.
A sacrificial camel is dyed with henna after a haircut produced patterns at the animal market on the outskirts of Karachi, Pakistan.
A Palestinian man rides a motorcycle carrying a sheep ahead of the Eid al-Adha festival in Khan Younis in the southern Gaza Strip.
A Syrian migrant offers Eid al-Adha prayers outside the Sarayici oil wrestling arena in Edirne, Turkey, September 24, 2015.
Shi’ite women attend prayers for the Muslim festival of Eid-al-Adha in Baghdad September 24, 2015.
Residents scramble to receive meat as food is distributed to the poor during an Eid al-Adha festival at a mosque in Surabaya September 24, 2015.
A man walks amid meat pieces to be distributed to the people during Eid al-Adha festival at Al-Iklas Mosque in Banda Aceh, September 24, 2015.
Photos by: REUTERS