They were surrounded by family and friends, including the athlete's elder two sons and nephew.
Heat owner Micky Arison, Chris Bosh and DJ Irie all posted Instagram pictures Saturday afternoon using #TheWadeUnion prior to the ceremony.
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Wade proposed to Union in December 2013 after four years of dating. Shortly after, it was revealed that he had fathered a son named Xavier with a friend, according to E!.
This is the second marriage for Union and Wade. Wade married Siohvaughn Funches, his high school sweetheart, in 2002. They welcomed sons Zaire and Zion. The pair broke up in 2007.
Union was married to NFL player Chris Howard from 2001 to 2006.