Lynn Swann played in four Super Bowls (IX, X, XIII and XIV). He won all four with the Steelers.
Steelers
Thurman Thomas played in four Super Bowls for the Buffalo Bills .... SBs XXV-XXVIII.
Started in four and won three!
The AFL and the NFL
Pittsburgh Steelers
Chuck Noll
The New York Giants have been to five Super Bowls, winning four of them.
Green Bay (First two) Jets Chiefs
Jerry Markbreit was the first official to referee in four Super Bowls (XVII, XXI, XXVI, and XXIX). The first official to participate in four Super Bowls was line judge Jack Fette (SBs V, VIII, X, XIII).
Yes ... not only are the Bills the only team to lose four consecutive Super Bowls they are the only team to ever play in four consecutive Super Bowls.
Four: Super Bowls XVI, XIX, XXIII and XXIV.