In voting announced Thursday night, Michael Strahan also was selected a modern-era finalist along with Charles Haley, Kevin Greene, Andre Reed, Jerome Bettis, Tim Brown, John Lynch, Will Shields, Aeneas Williams, Morten Andersen and Edward DeBartolo Jr. Senior nominees Ray Guy and Claude Humphrey were announced in August.
Bettis and Brown played at Notre Dame, Andersen got his start in football kicking for one season as an exchange student at Ben Davis High School.
Dungy posted a 139-69 record in 13 years as a head coach with Tampa Bay and Indianapolis. He won 85 games against just 27 losses in seven years with the Colts from 2002-08, coaching Indianapolis to the Super Bowl XLI championship in Miami.
Harrison played 13 seasons in the NFL, all with Indianapolis. He caught 1,102 passes in 190 career games, grabbing 128 touchdown catches during his career. The Colts drafted Harrison in the first round of the 1996 NFL Draft out of Syracuse University. He was named to the Pro Bowl team eight times in his career.
The 46-member selection committee will vote Feb. 1 in New York, with a minimum 80 percent required for induction.