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One of the first same-sex couples to be married as soon as the law allowed has said "I do" in front of a packed room of guests shortly after the stroke of midnight.
Peter McGraith and David Cabreza were another couple to take advantage of the new legislation as soon as they possibly could.
Actor Andrew Wale, 49, and guesthouse owner Neil Allard, 48, wed at the Royal Pavilion in Brighton just after midnight.
The Mayor of Camden Councillor Jonathan Simpson has hailed Britain as a "beacon" for countries worldwide and as an example for equal rights. Mr Simpson added that "tolerance and love will rule".
Human rights campaigner Peter Tatchell attended one of the first same-sex marriages in Britain, hailing the "historic occasion". Peter McGraith and David Cabreza was among the first to get married in Islington.
Mr Tatchell said during the wedding ceremony that "there should be one system for everyone".
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Gay rights activists Esther Nakimwero and Idris Bogerie have hailed Britain's first same-sex marriages, demanding the same rights come to Uganda.
David Cameron has hailed the first same-sex marriages in England and Wales as sending a "powerful message" about equality in Britain.
The law changed at midnight, with a number of gay couples vying to claim the title of being the first to be married in Britain by trying to time it perfectly so their vows were said just seconds after the clock struck 12.
The Prime Minister said the reform was necessary because "when people's love is divided by law, it is that law that needs to change".
Writing in Pink News he said "this weekend is an important moment for our country" because "we will at last have equal marriage in our country".
As gay and lesbian couples across England and Wales say I do, they will be in good company as broadcaster Sandi Toksvig renews her vows with Debbie Toksvig.
The free but ticketed event in the Royal Festival Hall on London's Southbank forms part of the centre's celebrations of the Marriage (Same Sex Couples) Act becoming legal from midnight.
The Radio 4 News Quiz presenter said the event would be a "joyous occasion" and invited the public to share the experience, at which they will joined by their four children.
Toksvig, who had a civil partnership with Debbie in 2007, said: "I look forward to celebrating with old and new friends. It is a public statement of pride in our love and thanks to all those who have campaigned for equality over many years."
MPs and councillors across England and Wales are celebrating the inauguration of the first same-sex marriage ceremonies taking place at midnight today. Yvette Cooper, Emily Thornberry and Terry Stacey attended ceremonies this evening.
As the countdown for the first same-sex marriages gets underway, Deputy Prime Minister Nick Clegg, former Green Party leader Caroline Lucas and shadow chancellor Ed Balls have hailed the momentous event.
Ed Miliband has joined Nick Clegg in welcoming the first same-sex marriages, which take place just after midnight tonight.
In a message for Pink News, the Labour leader said it was an "incredibly happy time" for same-sex couples as well as "an incredibly proud time for our country".
Latest ITV News reports
The first same-sex marriages in England and Wales have begun after changes in law giving gay couples the right to marry for the first time.