Some 3,500 identically-dressed couples took part in the ceremony in Gapyeong, north-east of the capital, Seoul.
A further 24,000 followers – often known as “Moonies” – were also married in other countries via video link.
The ceremony was presided over by Hak Ja-han, the widow of Sun Myung Moon, who died in September.
An estimated 30,000 people attended the 92-year-old’s funeral.
Four hundred of the Church’s members who were married on Sunday chose to have their partners selected for them by Hak Ja-han, something her late husband also did.
“I was pretty nervous,” Jin Davidson, a 21-year-old American, told the AFP news agency.
“Then all of a sudden she popped up in front of me, and I said OK.”
Jin Davidson, whose parents were paired off by Sun Myung Moon, said he struggled to communicate with his Japanese bride, Kotona Shimizu, 21.
“I speak no Japanese at all, and she only speaks a little English, but we see it as an exciting challenge and proof of our faith,” he added.
The mass weddings began in the early 1960s and over the years grew in size. In 1997, some 30,000 couple were married in Washington.
The Unification Church has been accused of brainwashing its followers and embezzlement.
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