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John Lewis Gilbert III (born July 13, 1928) is an American show business personality who has worked mainly on television game shows. Originally a nightclub singer and entertainer, he has hosted and announced a number of game shows from various eras, dating as far back as the 1950s. He is known primarily for his work as the announcer and audience host for the syndicated version of the quiz show Jeopardy! since its revival in 1984.
| Year | Title | Role | Notes |
| 1961 | Gidget Goes Hawaiian | Johnny Spring | Uncredited |
| 1967 | AVCO Hour of Stars | Vocalist | |
| 1979 | Rock 'n' Roll High School | Announcer | Uncredited |
| 1992 | White Men Can't Jump | Jeopardy! Announcer | Voice |
| 1996 | Ellen's Energy Adventure | Jeopardy! Announcer | Voice |
| 2005 | Jeopardy! An Inside Look at America's Favorite Quiz Show | Himself | |
| 2018 | Game Changers | Himself | TV movie |
| 2020 | What is Jeopardy!?: Alex Trebek and America's Most Popular Quiz Show | Himself |
| Year | Title | Role | Notes |
| 1952 | Bachelor's Haven | Host | |
| 1958 | Music Bingo | Emcee | |
| 1961 | Yours for a Song | Announcer | Uncredited |
| 1961–1962 | Camouflage | Announcer/Guest Host | 4 episodes |
| 1963–1965 | The Price Is Right | Announcer/Guest Host | 8 episodes |
| 1967 | The Bob Braun Show | Himself | 1 episode |
| 1968 | Fast Draw | Host | 1 episode |
| 1968–1969 | Beat the Odds | Host | |
| 1969 | The Movie Game | Announcer | |
| 1970–1971 | Words and Music | Announcer | |
| 1971–1976 | Sports Challenge | Announcer | |
| 1972–1973 | The Joker's Wild | Guest Announcer | |
| 1975–1976 | The Magnificent Marble Machine | Announcer | 15 episodes |
| 1977 | Hollywood Connection | Announcer | 85 episodes |
| 1979 | Make Me Laugh | Announcer | |
| Dinah! | Announcer | 1 episode | |
| 1980 | Chain Reaction | Announcer | 71 episodes |
| 1981 | The New Tic Tac Dough | Guest Announcer | |
| Family Feud | Guest Announcer | 21 episodes | |
| 1982 | Child's Play | Announcer | |
| 1982–1991 | The $25,000 Pyramid | Announcer | 267 episodes |
| The $10,000 Pyramid | Announcer | 107 episodes | |
| 1983 | Fantasy | Announcer | 1 episode |
| 1983–1984 | Go | Announcer | 40 episodes |
| Dream House | Announcer | 2 episodes | |
| 1984 | Every Second Counts | Announcer | 1 episode |
| Anything for Money | Announcer | 1 episode | |
| 1984–present | Jeopardy! | Announcer | >9,272 episodes |
| 1984; 1989 | Jackpot | Announcer | |
| 1985–1986 | Headline Chasers | Announcer | 2 episodes |
| 1985–1988 | The $100,000 Pyramid | Announcer | 100 episodes |
| 1986 | Celebrity Double Talk | Announcer | |
| $1,000,000 Chance of a Lifetime | Announcer | ||
| 1987 | Money in the Blank | Announcer | Unsold pilot |
| Win, Lose, or Draw | Announcer | ||
| 1988 | Mama's Family | Himself | Episode: "Mama on Jeopardy!" |
| Blackout | Announcer | 55 episodes | |
| 1988–1989 | Love Connection | Announcer | 195 episodes |
| 1989 | 227 | Announcer | Episode: "A Date to Remember" |
| 1990 | Cheers | Himself | Episode: "What Is... Cliff Clavin?" |
| The Finish Line | Announcer | Unsold pilot | |
| Super Jeopardy! | Announcer | 13 episodes | |
| The Quiz Kids Challenge | Announcer | ||
| 1990–2000 | Supermarket Sweep | Announcer | 27 episodes |
| 1992 | The Golden Girls | Himself | Episode: "Questions and Answers" |
| 1995 | Beverly Hills, 90210 | Himself | Episode: "Double Jeopardy" |
| 1995–2010 | Wheel of Fortune | Guest Announcer | 26 episodes |
| 1997 | Johnny Bravo | Jackie Jacques | 1 episode |
| 1999 | The Angry Beavers | TV Host | 1 episode |
| Year | Title | Role | Notes |
| 1998 | Jeopardy! | Announcer | Voice |
| 2000 | Jeopardy! 2nd Edition | Announcer | Voice |
| 2003 | Jeopardy! 2003 | Announcer | Voice |
| 2007 | Jeopardy! DVD Game | Announcer | Voice |
| 2010 | Jeopardy! America's Favorite Quiz Show | Announcer | Voice |