Dwyane Wade's NYC retirement party turned into a good Bye-Bye-Bye Bash Wednesday night ... when Justin Timberlake and Jessica Biel stopped by to celebrate D-Wade's career!
The party was crazy -- a '70s-themed rager at Catch NYC with costumes and great music and basketball stars ... including Wade's good friend Carmelo Anthony!
TMZ Sports obtained video from inside the party where you can see D-Wade, Gabby and Justin all gettin' down on the dance floor!