Mass gatherings have seen people uniting in prayer before slaughtering animals in honour of the willingness of Abraham to sacrifice his son for God.
Prayer-bent Muslim worshippers lined up in rows in at the Arena Civica in Milan, Italy, to offer their thanks.
Thousands of other followers gathered in a field in Nairobi, as well as the Almaty Central Mosque in Kazakhstan.
In the holy city of Mecca, Saudi Arabia, Muslim pilgrims stoned Jamarat pillars said to symbolise the devil.
Others were seen waiting in barbers for haircuts, selling sheep or preparing bowls of pastries and sweet tweets in preparation for the feasts to be later enjoyed.
In Syria, President Bashar Al-Assad attended prayers in Damascus, placing his hands on his knees as he prayed at a mosque with Syrian Grand Mufti Ahmad Badreddin Hassun.
Streets in Damascus were decorated with multi-coloured balloons and festivals adding a vibrancy to market centres.
In Beirut, children rode camels and fair-goers enjoyed rides on a ferris wheel.
Burgess Park in London was also the scene of families enjoying themselves for the four-day holy holiday.
Children could be seen frolicking in floating balls on water and riding dodgem cars with their parents.
What is Eid al-Adha?
Translated as the ‘Feast of Sacrifice’, Eid al-Adha commemorates Abraham’s decision to kill his son Ismail on the command of God, although he was stopped from completing the act.
As Abraham’s son was replaced by a goat by God instead, millions of Muslims mark the religious holiday today with the slaughter of livestock before eating it.
One third of the meat is generally given to poor individuals or those in need.
This year’s festival runs from the evening of Tuesday, August 21 until Saturday, August 25.
Eid al-Adha is held annually as the holy Hajj pilgrimage to Mecca, Saudi Arabia, comes to an end.
The pilgrimage is regarded as one of the five pillars of Islam and Muslims who are physically and financially able to make the journey must do so at least once in their lifetime.
The date changes every year as it follows the Islamic lunar calendar rather than the widely-used Gregorian calendar.
What is Eid al-Fitr?
Eid al-Fitr, the second Islamic festival commemoration the end of fasting during Ramadan, was held in June.