They are Derrick Strait of Oklahoma, Florida's Keiwan Ratliff, and Sean Taylor of Miami (Fla.).
Ratliff leads the SEC with nine interceptions and has 47 tackles, six pass breakups, a fumble recovery, and a blocked kick.
Strait has three interceptions for 127 yards, 11 pass breakups, 61 tackles, two forced fumbles, and four fumble recoveries.
"No player has had a greater impact on our program since we've been here than Derrick," said Oklahoma Coach Bob Stoops.
Taylor has seven interceptions, returning three of them for touchdowns, 71 tackles, 13 pass breakups, and one quarterback sack.
The winner of the award, to be determined by a vote of a nationwide panel of former coaches, players, sportswriters and sportscasters, will be announced Dec. 11 in a live presentation by ESPN at Disney World in Orlando.