The celebrations began late last night with worshipers congregating at churches and cathedrals amid tight security arrangements.
Braving winter chill, people spent hours in long queues to attend the midnight mass rejoicing the birth of Jesus Christ with traditional fervour and gaiety.
People prayed for world peace and brotherhood on this auspicious day.
"Christmas is a festival we look forward to. What better day than Christmas to offer peace among mankind?" Father John Mathew of Sacred Heart Cathedral in Central Delhi said.
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As many as 224 churches were put on "tight vigil" with armed police personnel guarding them, and PCR vans patrolling areas surrounding the churches to ensure peaceful celebrations.
Security was beefed up across the city, especially at the St Sebastian's Church in East Delhi's Dilshad Garden, which was gutted in fire this month.
The minimum temperature in the capital was recorded six degrees Celsius, two notches below normal. The thick layer of fog gave way to sun as the day progressed.