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- 1Jay Leno (guest host), Richard Chamberlin, John Mendoza, Craig T. NelsonJanuary 2, 1990
- 2Tony Danza, Chuck BerryJanuary 3, 1990
- 3Rita Rudner, K. T. OslinJanuary 4, 1990
- 4Jay Leno (guest host), Denzel Washington, John Chancellor, Faith Ford, Richard MarxJanuary 9, 1990
- 5Richard Benjamin, Larry GatlinJanuary 10, 1990
- 6Bill Black, Tony Randall, Diane Nichols, Kenny RankinJanuary 11, 1990
- 7Jay Leno (guest host), Charlton Heston, Roy Blount, Jr.January 12, 1990
- 8Jay Leno (guest host), Andie MacDowell, Marsha Warfield, Michael MooreJanuary 16, 1990
- 9Baxter Black, The RochesJanuary 17, 1990
- 10Joan Embery, Art Donovan, Ron SilverJanuary 18, 1990
- 11Michael Landon, Jimmy Brogan, Roger ReeseJanuary 19, 1990
- 12Jay Leno (guest host), Sandy Duncan, Michael Gross, Fred Roggin, PocoJanuary 22, 1990
- 13Jay Leno (guest host), Steve Kelly, Gloria Estefan and Miami Sound MachineJanuary 23, 1990
- 14Jay Leno (guest host), Shelley Winters, Mr. Wizard, Hoyt AxtonJanuary 24, 1990
- 15Jay Leno (guest host), Jack Palance, Paul ShafferJanuary 25, 1990
- 16Jay Leno (guest host), Joanna Kerns, Charles Grodin, Bonnie RaittJanuary 26, 1990
- 17Jay Leno (guest host), Connie Chung, Dennis Hopper, Highway 101January 30, 1990
- 18Martin Short, Cathy Ladman, Bonnie HuntJanuary 31, 1990
- 19Stephanie Yu, Kenneth Branagh, Cathy GuisewiteFebruary 1, 1990
- 20Carl Reiner, Jennifer GreyFebruary 2, 1990
- 21Jay Leno (guest host), Jason Bateman, Linda HopkinsFebruary 6, 1990
- 22Don Rickles, Jon SerlFebruary 7, 1990
- 23Harry Anderson, Bobby Slayton, Eugene FodorFebruary 8, 1990
- 24Beau Bridges, Rita Rudner, Melissa ManchesterFebruary 9, 1990
- 25Jay Leno (guest host), Carol Kane, Dom Irrera, Stephen Baldwin, Laurie AndersonFebruary 13, 1990
- 26John Larroquette, Dr. Robert Ballard, Jack JonesFebruary 14, 1990
- 27Super Dave Osborne, Stephanie MillsFebruary 15, 1990
- 28Bob Hope, Magic Johnson, Joe WilliamsFebruary 16, 1990
- 29Jay Leno (guest host), Bea Arthur, Paula Poundstone, Al JarreauFebruary 20, 1990
- 30Bob Newhart, Buster Douglas, Bo DiddleyFebruary 21, 1990
- 31Jessie Hairston, Aaron Neville, Linda RonstadtFebruary 22, 1990
- 32Dabney Coleman, Kenneth Branagh, Restless HeartFebruary 23, 1990
- 33Jay Leno (guest host), Jeff Foxworthy, Crispin Glover, Natalie ColeMarch 6, 1990
- 34Renee Hall, Burt Reynolds, Ray PriceMarch 7, 1990
- 35Victoria Jackson, Calvin Trillin, The TemptationsMarch 8, 1990
- 36Meredith Vieira, Ofra HazaMarch 9, 1990
- 37Jay Leno (guest host), Harry Hamlin, Neil Patrick Harris, Ritch Shydner, Michael BoltonMarch 13, 1990
- 38Jonathan Winters, Randy TravisMarch 14, 1990
- 39Hassie & Lassie, Smokey RobinsonMarch 15, 1990
- 40Jeff Cesario, Lee TrevinoMarch 16, 1990
- 41Jay Leno (guest host), Valerie Harper, Rain Pryor, Mario JoynerMarch 20, 1990
- 42George Preston, Don McLeanMarch 21, 1990
- 43Larry Miller, Lyle LovettMarch 22, 1990
- 44Kareem Abdul-Jabbar, Park Overall, Sara HickmanMarch 23, 1990
- 45Jay Leno (guest host), Marsha Warfield, Jimmy Aleck, Roy Blount, Jr., Regina BelleMarch 26, 1990
- 46Jay Leno (guest host), Jean Stapleton, Starlight ExpressMarch 27, 1990
- 47Jay Leno (guest host), Carol Burnett, Martin Mull, Edie McClurgMarch 28, 1990
- 48Jay Leno (guest host), Dana Carvey, Wayne Cotter, Dana DelanyMarch 29, 1990
- 49Jay Leno (guest host), Roger Moore, Sam DonaldsonMarch 30, 1990
- 50Jay Leno (guest host), Rutger Hauer, Bob Costas, They Might Be GiantsApril 3, 1990
- 51Dudley Moore, Kevin Pollak, Shawn ColvinApril 4, 1990
- 52Bryan Williams, Lily Tomlin, Bulgarian State Female Vocal ChoirApril 5, 1990
- 53Bob Hope, Jeff Dunham, B.B. KingApril 6, 1990
- 54Jay Leno (guest host), Carol Siskind, Robert Hays, Mike BinderApril 10, 1990
- 55Richard Lewis, Ray CharlesApril 11, 1990
- 56Paula Poundstone, Art Donovan, Milt HintonApril 12, 1990
- 57Paul Reiser, Mary Peyton-Meyer, Johnny Clegg & SavukaApril 13, 1990
- 58Jay Leno (guest host), Billy Crystal, Dave Thomas, Michel'leApril 16, 1990
- 59Jay Leno (guest host), Dweezil Zappa, Jerry Seinfeld, Judith HoagApril 17, 1990
- 60Jay Leno (guest host), Christine Lahti, Crystal Bernard, Huber MarionettesApril 18, 1990
- 61Jay Leno (guest host), Alan Thicke, Fred Roggin, Julia ForehamApril 19, 1990
- 62Jay Leno (guest host), Valerie Bertinelli, Paul Reiser, The Desert Rose BandApril 20, 1990
- 63Jay Leno (guest host), Chuck Norris, Meredith Baxter Birney, Jeff Altman, Ricky Van SheltonApril 24, 1990
- 64Sonny Bono, Alexie SultanovApril 25, 1990
- 65Tim Conway, Clint BlackApril 26, 1990
- 66Mary Peyton-Meyer, Robert Klein, Kevin SpaceyApril 27, 1990
- 67Jay Leno (guest host), Armand Assante, Clive James, Jane GoodallMay 1, 1990
- 68Dabney Coleman, Yakov SmirnoffMay 2, 1990
- 69Richard Jeni, Daniel MenendezMay 3, 1990
- 70Judge Reinhold, Rita RudnerMay 4, 1990
- 71Jay Leno (guest host), Teri Garr, Eva Marie Saint, Keenen Ivory WayansMay 8, 1990
- 72Tony Randall, Lara Flynn Boyle, Andy Koffman & His FrogsMay 9, 1990
- 73John Larroquette, Mark Schiff, Kurt ThomasMay 10, 1990
- 74Joe Piscopo, Dirty Dozen Brass BandMay 11, 1990
- 75Jay Leno (guest host), Keith Carradine, Blake Clark, Diana BellamyMay 15, 1990
- 76George Foreman, Sarah BrightmanMay 16, 1990
- 77Dr. Henry Merritt Stenhouse, Barbara Hershey, Jeff CesarioMay 17, 1990
- 78Bob Hope, Al GreenMay 18, 1990
- 79Jay Leno (guest host), George Carlin, Fran Drescher, Dominick DunneMay 29, 1990
- 80Jerry Seinfeld, Dizzy GillespieMay 30, 1990
- 81David Brenner, Arnold Schwarzenegger, 1990 National Acrobatic ChampionsMay 31, 1990
- 82Buddy Hackett, Teresa Ganzel, Dave ThomasJune 1, 1990
- 83Jay Leno (guest host), Larry Miller, John Chancellor, Joe CockerJune 5, 1990
- 84Tony Bennett, A. Whitney Brown, Judith HoagJune 6, 1990
- 85Jay Leno (guest host), Cathy Guisewite, Edie McClurg, Stevie Ray VaughanJune 7, 1990
- 86Patrika DarboJune 8, 1990
- 87Jay Leno (guest host), Bill Cosby, Luther VandrossJune 12, 1990
- 88Bob Newhart, Peter Jennings, David ByrneJune 13, 1990
- 89Garry Shandling, Barry ManilowJune 14, 1990
- 90Super Dave Osborne, Kirk DouglasJune 15, 1990
- 91Jay Leno (guest host), Harry Hamlin, Sharon Stone, Julia Child, Lenny KravitzJune 18, 1990
- 92Jay Leno (guest host), Molly Ringwald, Kadeem Hardison, Bill Engvall, Cowboy JunkiesJune 19, 1990
- 93Jay Leno (guest host), Julia Louis-Dreyfus, Phil Hartman, Roy Blount, Jr., Linda HopkinsJune 20, 1990
- 94Jay Leno (guest host), Deborah Norville, Thom Sharp, Peter WellerJune 21, 1990
- 95Jay Leno (guest host), Bill Murray, Alan King, Leon RedboneJune 22, 1990
- 96Jay Leno (guest host), Tony Randall, Wil Shriner, Faith Ford, Freda PayneJuly 2, 1990
- 97Jay Leno (guest host), Peter Scolari, Rita Rudner, Lauren Tom, BasiaJuly 3, 1990
- 98Jay Leno (guest host), Joan Embery, Fred RogginJuly 4, 1990
- 99Jay Leno (guest host), Tom Cruise, Phil Hartman, Helen Hayes, Barry WhiteJuly 5, 1990
- 100Jay Leno (guest host), Larry King, Jeff Daniels, Tom DreesenJuly 6, 1990
- 101Jay Leno (guest host), Charlie Korsmo, Martin Mull, Bill Maher, Lyle LovettJuly 10, 1990
- 102Dana Carvey, Anthony GriffinJuly 11, 1990
- 103George Segal, King's SistersJuly 12, 1990
- 104Bob Saget, Laura BraniganJuly 13, 1990
- 105Jay Leno (guest host), Patrick Swayze, Randy Quaid, Jeff Foxworthy, Reba McEntireJuly 17, 1990
- 106Mike Dugan, Monica Selles, Dionne WarwickJuly 18, 1990
- 107Cathy Ladman, Tom Wilson, Pointer SistersJuly 19, 1990
- 108Maggie Gill, Roseanne Barr, Tom ArnoldJuly 20, 1990
- 109Jay Leno (guest host), Jack Palance, Patty LovelessJuly 24, 1990
- 110Michael Oliver, John Goodman, Joe WilliamsJuly 25, 1990
- 111Liv Ullman, J.J. Wall, Patrika DarboJuly 26, 1990
- 112Cathy Guisewite, Brian Haley, David HorowitzJuly 27, 1990
- 113Jay Leno (guest host), Brian Dennehy, Park Overall, Lou GrammJuly 31, 1990
- 114Don Rickles, The Allman Brothers BandAugust 1, 1990
- 115Maria Shriver, Michael McDonaldAugust 2, 1990
- 116David Brenner, Art Donovan, Al GreenAugust 3, 1990
- 117Jay Leno (guest host), Kirk Douglas, Willy T. Ribbs, Taylor DanneAugust 6, 1990
- 118Jay Leno (guest host), Jon Voight, Kevin Pollak, Steven R. Kutcher, Howard HewittAugust 7, 1990
- 119Jay Leno (guest host), Mel Gibson, Harley Jane Kozak, David Alan GrierAugust 8, 1990
- 120Jay Leno (guest host), Tim Matheson, Phil Hartman, Mike Myers, Wayne Cotter, Shari BelafonteAugust 9, 1990
- 121Jay Leno (guest host), Henry Winkler, Kevin Nealon, Sarah Jessica ParkerAugust 10, 1990
- 122Jay Leno (guest host), Steve Martin, James Belushi, James IngramAugust 14, 1990
- 123Harry Anderson, Joel MurrayAugust 15, 1990
- 124Denise Wells, David SteinbergAugust 16, 1990
- 125Patrick Swayze, Oleta AdamsAugust 17, 1990
- 126Jay Leno (guest host), Emilio Estevez, Phil Hartman, Lauren TomAugust 17, 1990
- 127Richard Lewis, Brooke Adams, The Leningrad Swing Jazz BandAugust 22, 1990
- 128Kid Inventors, Natalie ColeAugust 23, 1990
- 129Tony Randall, Mark Pitta, George ForemanAugust 24, 1990
- 130Jay Leno (guest host), Shirley MacLaine, David Lynch, Richard Libertini, Paul YoungSeptember 4, 1990
- 131Charles Grodin, Amy Yasseck, B.B. KingSeptember 5, 1990
- 132Zachary Lavoy, Charles Dutton, K.T. OslinSeptember 6, 1990
- 133Jeff Dunham, Etta James & The Roots Band, The Passing ZoneSeptember 7, 1990
- 134Jay Leno (guest host), Candice Bergen, Charlie Schlatter, George MillerSeptember 11, 1990
- 135Patrick Duffy, Kevin Meaney, Kid Creole & The CoconutsSeptember 12, 1990
- 136Martin Mull, Anne DeSalvoSeptember 13, 1990
- 137Bob Hope, Park Overall, Pete SamprasSeptember 14, 1990
- 138Jay Leno (guest host), Burt Reynolds, Robert Easton, Wynton MarsalisSeptember 17, 1990
- 139Jay Leno (guest host), Shelley Long, Keenen Ivory Wayans, The TimeSeptember 18, 1990
- 140Jay Leno (guest host), Carol Burnett, Will Smith, Regis PhilbinSeptember 19, 1990
- 141Jay Leno (guest host), Christine Lathi, Ed Begley, Jr., Dinah ManoffSeptember 20, 1990
- 142Jay Leno (guest host), Phil Collins, Jimmy Smits, Celine DionSeptember 21, 1990
- 143Jay Leno, Betty White, Ladysmith Black MambazoSeptember 25, 1990
- 144Garry Shandling, Victoria WilliamsSeptember 26, 1990
- 14528th Anniversary ShowSeptember 27, 1990
- 146Jay Leno (guest host), Fred Savage, Matthew ModineSeptember 28, 1990
- 147Jay Leno (guest host), Paul Sorvino, Peggy Lipton, John HiattOctober 2, 1990
- 148Rita Rudner, Becky Klemt, Johnny Clegg & SavukaOctober 3, 1990
- 149Alan King, Maryedith Burrell, George BensonOctober 4, 1990
- 150Robert Klein, Jackie Collins, Bela Fleck & The FlecktonesOctober 5, 1990
- 151Jay Leno (guest host), Elizabeth Perkins, Perry King, Paula PoundstoneOctober 9, 1990
- 152Shelby Foote, Louie BellsonOctober 10, 1990
- 153Father Guido Sarducci, Jim FowlerOctober 11, 1990
- 154Teri Garr, Kevin PollakOctober 12, 1990
- 155Jay Leno (guest host), Tom Selleck, Will Smith, Take 6October 15, 1990
- 156Jay Leno (guest host), Craig T. Nelson, Helen Thomas, Garth BrooksOctober 16, 1990
- 157Jay Leno (guest host), Amy Irving, Rich Hall, Scott BakulaOctober 17, 1990
- 158Jay Leno (guest host), Kadeem Hardison, Barry Levinson, The Neville BrothersOctober 18, 1990
- 159Jay Leno (guest host), Angela Lansbury, Walter Cronkite, John DenverOctober 19, 1990
- 160Jay Leno (guest host), Kate Jackson, Wayne Cotter, Patty LovelessOctober 30, 1990
- 161John Larroquette, Anthony Griffith (actor), Kevin PollakOctober 31, 1990
- 162Carl Reiner, Shelby Foote, Garry MorrisNovember 1, 1990
- 163Ed Begley, Jr., Calvin Trillin, Cupstacking ChampionsNovember 2, 1990
- 164Jay Leno (guest host), Robert Urich, Sally Jessy Raphael, Johnny DarkNovember 6, 1990
- 165George Segal, Neil Patrick HarrisNovember 7, 1990
- 166Super Dave Osborne, Paul ReiserNovember 8, 1990
- 167George Foreman, Joanna Kerns, James IngramNovember 9, 1990
- 168Jay Leno (guest host), Marilu Henner, Franklin Ajaye, Charles KuraltNovember 13, 1990
- 169Harry Anderson, Bob Uecker, Dan FogelbergNovember 14, 1990
- 170Bob Newhart, Catherine O'Hara, Celine DionNovember 15, 1990
- 171Jester Hairston, Rita Rudner, Joan Benny, Jimmy BuffettNovember 16, 1990
- 172Jay Leno (guest host), Sharon Gless, Michael Moriarty, Mariah CareyNovember 20, 1990
- 173Father Guido Sarducci, Ray CharlesNovember 21, 1990
- 174Dean Dill, Cirque du SoleilNovember 22, 1990
- 175James Garner, Andy Grayson, Sara HickmanNovember 23, 1990
- 176Jay Leno (guest host), Charlie Sheen, Judy CollinsDecember 4, 1990
- 177Kelly McDonald, Randy TravisDecember 5, 1990
- 178George Carlin, Pete FountainDecember 6, 1990
- 179David Letterman, Patti LaBelleDecember 7, 1990
- 180Jay Leno (guest host), Clint Eastwood, Olivia Newton-John, Whitney HoustonDecember 11, 1990
- 181Richard Benjamin, Johnn Clegg & SavukaDecember 12, 1990
- 182Bob Hope, Kirstie Alley, John Travolta, The Go-Go'sDecember 13, 1990
- 183Mark Schiff, Kadeem Hardison, Dolly PartonDecember 14, 1990
- 184Jay Leno (guest host), Glenn Close, John Chancellor, Bill Maher, Rosanne CashDecember 17, 1990
- 185Jay Leno (guest host), Kathy Bates, Barry Manilow, K.T. OslinDecember 18, 1990
- 186Jay Leno (guest host), Jacqueline Bisset, Johnny MathisDecember 19, 1990
- 187Jay Leno (guest host), John Mendoza, The Jeff Healey BandDecember 20, 1990
- 188Jay Leno (guest host), James Avery, Paul Hogan, Lou RawlsDecember 21, 1990
- 189Jay Leno (guest host), Jane Pauley, Phil Hartman, B.B. King, Dwight YoakamDecember 31, 1990