Winston was also tabbed as the conference's Offensive Player of the Year, a day after he was selected as its Rookie of the Year.
Winston is the first redshirt freshman in the 61-year history of the conference to earn its top honor. He received 47 of 65 votes from the Atlantic Coast Sports Media Association. Boston College running back Andre Williams had 13 votes and Pittsburgh defensive tackle Aaron Donald had four.
Donald was voted the ACC's Defensive Player of the Year.
Winston led the undefeated Seminoles to the No. 1 spot in the BCS standings. Florida State (12-0, 8-0 ACC) plays No. 20 Duke (10-2, 6-2) Saturday for the conference championship.
The last Florida State player named ACC Player of the Year was Heisman Trophy winner Chris Weinke in 2000.
Winston leads the nation with a 192.6 passer rating. He also leads the conference with 3,490 passing yards and 35 touchdowns. The Heisman Trophy candidate is being investigated for an alleged sexual assault from last December.