NFL's Greg Olsen -- '69 Camaro Sells for $100k ... to NASCAR Honcho

Great news for Carolina Panthers tight end Greg Olsen ... whose classic Camaro just sold for $100k to a NASCAR team owner -- and 100% of the money went to an amazing cause.

Olsen put his custom '69 Chevy Camaro convertible up for auction -- with the entirety of the winning bid going to his HEARTest Yard charity ... which provides medical services to families of babies with heart problems.

Well, NASCAR team owner Rick Hendrick -- owner of Hendrick Motorsports -- saw the whip and HAD to have it ... throwing down $100k to win the auction.

FYI, Hendrick is a HUGE car collector -- and loves Camaros -- so it was a perfect fit.

Even better news ... the auction house, Barrett-Jackson -- didn't take one cent of commission, ensuring every penny will go to the charity.