Across the entire South East Asia - in Bangkok, Singapore, Malaysia, the Philippines, Brunei, Myanmar, Laos, Cambodia, Vietnam and Indonesia, patriotic fervour gripped Indians who turned out in large numbers to mark the celebrations.
Cultural festivities were held amid strains of the mellifluous 'Jana Gana Mana' and the unfurling of the national tricolour accompanied by falling rose petals at Indian embassies and high commissions.
In Bangkok, more than 550 Indian nationals and friends of India, braved the sudden drop in temperature to attend the function at the Indian embassy premises.
Bishnoi also read out excerpt from President Pranab Mukherjee's address.
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Later, schoolchildren sang songs to regale the audience following which Bishnoi presented some gifts to them as a token of appreciation.
In Hanoi, India's Ambassador to Vietnam Preeti Saran hoisted the national flag and read out excerpts of the President's message to the nation which was extremely well received. At least 200 members of the Indian community attended the function despite the cold weather and rains.
Later, patriotic songs were sung by students.
Despite being a working day, the function was attended by about 300 people.
In Australia, the Republic Day celebrations coincided with the Australia Day - the country's official National Day.
The celebrations were held across the country by a large number of Indian diaspora members who attended the Indian flag-hoisting ceremonies and other events held across the cities.
In the capital Canberra, Indian High Commissioner Navdeep Suri unfurled the tricolour at a function held at the Indian High Commission building with a large number of community members from in and around the capital.
He also drew attention to the epic 'Spirit of India Run'
that the distinguished ultra marathoner Australian, Pat Farmer, would undertake from Kanyakumari today.
The 53-year-old former Australian minister would kick off his 66-day-long run, symbolising that India and Australia celebrated their special day on the same date. Pat plans to cover 4,600 kms and would be wearing a Go Pro camera on his head to show India through his eyes.
In Melbourne, the celebrations were also marked by the flag-hoisting ceremony at the embassy by the Consul General Manika Jain.
Members including local politicians of Indian-origin Intaj Khan and Manoj Kumar, and Indian traders of the precinct sang national anthems of the two countries and unfurled both the nationalflags.
In Sydney too, the flag-hoisting ceremony was held to mark the occasion.
Meanwhile, congratulating India on its special day, Australian Prime Minister Malcolm Turnbull tweeted: "Best wishes and congratulations to you and the People of Indiaon Republic Day".
Echoing similar sentiments, New South Wales Premier Mike Baird said: "Indian Australians have made invaluable contributions to the social, cultural, professional and economic life of New South Wales.
"After my visit to India last year, I am confident that our nations will grow even closer as we embrace trade partnerships and cultural opportunities," he said.
He also praised the Indian community for its commitment to interfaith dialogue and in fostering social harmony, and wished everyone a happy and safe holiday season.
Australia Day commemorates the establishment of the first European settlement at Port Jackson, now part of Sydney, in 1788.
Singh read out the President's address to the nation to more than 400 Indians attending the celebrations.
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In Japan, Indian envoy H E Sujan R Chinoy unfurled the national flag at the Indian Embassy in Tokyo where a large number of expats had gathered.
Despite it being a working day in Japan, more than 450 Indian nationals attended the programme.
A separate reception was also organised which saw participation of close to 600 guests including two former Japanese Prime Ministers Yoshiro Mori and Dr Yukio Hatoyama and other senior leaders.
A photo exhibition of Prime Minister Narendra Modi's visit to Japan in November 2016 and "Indian Deities Worshipped in Japan" was showcased at the Republic Day reception.