Grundy polled 174 votes, while ultra-consistent skipper Scott Pendlebury (158) was runner-up and dashing defender Jack Crisp (147) also finished on the podium.
"My life has changed forever playing for the Collingwood Football Club. It's been a home for me since I turned 18 away from home, coming from interstate," Grundy said.
"To go to games and see people with the No.4 on their jumper or wear one sock up, one sock down … I'll never be able to say thank you enough for how supported I've felt by the Magpie supporters.
"Each week I try to put it all out there and try to repay them and my teammates and coaches for all their support.
"My life is far better for being involved with this organisation and I'm looking forward to next year."