Qantas, Commonwealth Bank and ANZ Australia are among the wave of companies endorsing the nation's Yes vote.
Australian businesses have applauded the nation's majority Yes decision in the national same-sex marriage postal survey.
Qantas, Commonwealth Bank and ANZ were among those warmly endorsing the 61.6 per cent Yes vote announced on Wednesday by the Australian Bureau of Statistics.
"We're delighted for our customers and our people who are celebrating today following the 'yes' outcome of the Australian Marriage Law survey," the Commonwealth Bank said on Twitter.
More than 840 corporations are registered with the Australian Marriage Equality organisation in supporting same-sex marriage including Airbnb, Apple, American Express, McDonald's, Mirvac, Ten Network, Virgin Australia and Telstra.
A majority Yes vote was recorded in 133 of the 150 federal electorates across the country.
Telstra boss Andy Penn said the outcome was a great step forward for a more diverse and inclusive Australia.
"We want Telstra to be a great place to work, a place to belong, a place where people can bring all of themselves to work and feel valued irrespective of their background, race, religion, age, gender or sexual preference," Mr Penn said in a statement.
"All eyes are now on the parliament to see how this view will be translated into action."
Parliamentary debate to legalise same-sex marriage could begin as early as Thursday.
Business Council of Australia chief executive Jennifer Westacott called the result a "victory for all those who have felt like outsiders for so long".
"This is a victory for common sense and for the decency and fairness of the clear majority of Australians," Ms Westacott said in a personal statement.
"I hope we can now move forward as Australians to a more inclusive society."