| International
Quartet Champs |
| Year | Quartet | Tenor | Lead | Bari | Bass |
| 1999 | FRED | Jared Carlson | Rick LaRosa | Clay Hine | Joe Clay |
| 1998 | Revival | Royce Ferguson | Mike Spencer | Mike Lawton | Bill Myers |
| 1997 | Yesteryear | Dan Trakas | Mark Blake | Rod Nixon | Randy Baughman |
| 1996 | Nightlife | Rob Menaker | John Sasine | Jeff Baker | Brett Littlefield |
| 1995 | Marquis | Dale Fetick | Randy Chisholm | Paul Gilman | Jay Hawkins |
| 1994 | Joker's Wild | Steve Iannacchione | Mark Green | Steve Legters | Dave Kindinger |
| 1993 | The Gas House Gang | Kipp Buckner | Rich Knight | Rob Henry | Jim Henry |
| 1992 | Keepsake | Roger Ross | Joe Connelly | Tony DeRosa | Don Barnick |
| 1991 | The Ritz | Jim Shisler | Doug Nichol | Don J. Hiner | Ben Ayling |
| 1990 | Acoustix | Todd Wilson | Rick Middaugh | Jason January | Jeff Oxley |
| 1989 | Second Edition | Fred Farrell | David Harrington | Doug Harrington | Jamie Meyer |
| 1988 | Chiefs of Staff | Tim McShane | Chuck Sisson | Dick Kingdon | Don Bagley |
| 1987 | Interstate Rivals | Kipp Buckner | Joe Connelly | Paul Gilman | Jay Hawkins |
| 1986 | Rural Route 4 | Don Kahl | Calvin Yoder | Jim Bagby | Willard Yoder |
| 1985 | The New Tradition | John Sherburn | Dan Jordan | Bobby Gray Jr. | John Miller |
| 1984 | The Rapscallions | David Smotzer | David Wallace | Timothy Frye | Jeff Oxley |
| 1983 | Side Street Ramblers | Keith Houts | Brian Beck | Dennis Malone | Earl Hagn |
| 1982 | Classic Collection | Curt Hutchinson | Larry Wilson | George Davidson | Terry Heltne |
| 1981 | Chicago News | Ray Henders | Butch Koth | Greg Wright | Tom Felgen |
| 1980 | Boston Common | Kent D. Martin | Richard C. Knapp | Larry Tully | Terry M. Clarke |
| 1979 | Grandma's Boys | Don Barnick | Hank Brandt | Jay Giallombardo | John Miller |
| 1978 | Bluegrass Student Union | Allen Hatton | Ken Hatton | Dan Burgess | Richard Staab |
| 1977 | Most Happy Fellows | Robert Hodge | Larry Hassler | Jack Lyon | Ken Hawkinson |
| 1976 | Innsiders | Mike Cox | John Devine | Guy McShan | Tom Pearson |
| 1975 | Happiness Emporium | Bob Dowma | Rod Johnson | Bob Spong | Jim Foy |
| 1974 | Regents | Harry Williamson | Joe Mazzone | Ron Knickerbocker | Hal Kauffman |
| 1973 | Dealer's Choice | Al Kvanli | Bill Thornton | Brian Beck | Gary Parker |
| 1972 | Golden Staters | Gary Harding | Milt Christensen | Jack Harding | Mike Senter |
| 1971 | Gentlemen's Agreement | Al Rehkop | Drayton Justus | Glenn Van Tassel | Bob Whitledge |
| 1970 | Oriole Four | Bob Welzenbach | Jim Grant | H. Fred King | Don Stratton |
| 1969 | Mark IV | Franklin Spears | Al Koberstein | Dale Deiser | Mo Rector |
| 1968 | Western Continentals | Al Mau | Ted Bradshaw | Paul Graham | Phillip Foote |
| 1967 | Four Statesmen | Frank Lanza | Richard A. Chacos | Richard J. Sause | Donald Beinema |
| 1966 | Auto Towners | Al Rehkop | Glenn Van Tassel | Clint Bostick | Carl Dahlke |
| 1965 | Four Renegades | Warren (Buzz) Haeger | Ben Williams | Jim Foley | Tom Felgen |
| 1964 | Sidewinders | Jerry Fairchild | Joe Daniels | Gene Boyd | Jay Wright |
| 1963 | Town And Country Four | Leo Sisk | Larry Autenreith | Jack Elder | Ralph Anderson |
| 1962 | Gala Lads | Dave Panther | Tom Keehan | Gordon Lees | Bill Cockrell |
| 1961 | Suntones | Gene Cokeroft | Bob Franklin | Harlan Wilson | Bill Cain |
| 1960 | Evans Quartet | Thayer (Turk) Evans | Preston Evans | Gene (Smitty) Smith | Jack Evans |
| 1959 | Four Pitchikers | Larry Hedgepeth | Keith Keltner | Wendell Keith Young | Joe V. Delzell |
| 1958 | Gay Notes | Harold Jones | Howard Rinkel | John Loots | Morris(Mo) Rector |
| 1957 | Lads of Enchantment | Don Pitts | Dan Aycock | Carlton Wright | Gil Wallace |
| 1956 | Confederates | George Evans | Dave LaBonte | Bill (Buzz)Busby | Wally Singleton |
| 1955 | Four Hearsemen | Wendell Heiny | Deane Watson | Dwight Elliott | Dick Gifford |
| 1954 | Orphans | O.H.(Bud) Bigham | Robert Groom | Pete Tyree | (Jay) Bond |
| 1953 | Vikings | Robert Maurus | Bruce Conover | Robert Lindley | Robert Livesay |
| 1952 | Four Teens | John Steinmetz | Jim Chinnock | Don Lamont | Don Cahall |
| 1951 | Schmitt Brothers | Joseph Schmitt | James Schmitt | Paul Schmitt | Francis Schmitt |
| 1950 | Buffalo Bills | Vernon Reed | Al Shea | Dick Grapes | Bill Spangenberg |
| 1949 | Mid States Four | Bob Mack | Marty Mendro | Forry Haynes | Art Gracey |
| 1948 | Pittsburghers | Harry Conte | Tom Palamone | John (Jiggs)Ward | Bill Conway |
| 1947 | Doctors of Harmony | H.H.(Jumbo) Smith | Max (Junior) Cripe | Elton (Butch) Hummel | Lee (Rev) Kidder |
| 1946 | GardenStateQuartet | Ted Rau | Bob Freeland | Jack Briody | Joe Marrese |
| 1945 | Misfits | Joe Murrin | Arthur Bielan | Ellis (Cy)Perkins | Pete Buckley |
| 1944 | Harmony Halls | Ed Gaikema | Bob Hazenberg | Ray (Curly) Hall | Gordon Hall |
| 1943 | Four Harmonizers | Charles Schwab | Leo Ives | Huck Sinclair | Fred Stein |
| 1942 | Elastic Four | Herman Struble | Roy Frisby | Jim Doyle | Frank H. Thorne |
| 1941 | Chord Busters | N.T.(Doc) Enmeier | Robert Holbrook | Robert Greer | Tom Masengale |
| 1940 | Flat Foot Four | (Johnny) Whalen | Britt Stegall | (Red) Elliott | Sam Barnes |
| 1939 | Bartlesville Barflies | George McCaslin | Harry Hall | Bob Durand | Herman Kaiser |
