NFL's Victor Cruz -- Massive Mansion Party ... For 'The Return'

He's calling it "The Return" -- Victor Cruz's comeback after missing most of last season to a knee injury ... and this weekend, his family threw the NY Giants receiver a massive mansion pool party to send him off!

TMZ Sports obtained pics from the bash that went down at the 28-year-old's insane crib in New Jersey ... where roughly 60 guests rocked Victor's #80 jersey to show their support.

We're told Vic's mom was the driving force behind the shindig -- and Victor was so touched, he gave a speech assuring people he was going to be better than ever this season!

If you recall, Cruz went down in Week 6 last year ... tearing the patellar tendon in his right knee. It was brutal.

BTW, Vic also got a custom "The Return" cake, and "The Return" balloons ... and guests played a trivia game about Vic's career.

Unfortunately for Vic, he's still dealing with an injury to his calf ... so his "return" might be postponed until Week 2 or 3.

Stay tuned ..