The first season of the American television situation comedy Leave It to Beaver premiered on October 4, 1957 and concluded on July 16, 1958. It consisted of 39 episodes shot in black-and-white, each running approximately 25 minutes in length. This was the only season that the show originally aired on CBS.

Jerry MathersTheodore 'Beaver' Cleaver

Barbara BillingsleyJune Cleaver

Hugh BeaumontWard Cleaver

Tony DowWally Cleaver

Cindy CarolPenny Jamison

Madge BlakeMrs. Margaret Mondello

John HoytDoctor Compton

Joseph CrehanTrain Conductor

William SchallertMr. Bloomgarden

Will WrightPete at Firehouse #7

Ann DoranAgnes Haskell

Jackie KelkMr. Merkel

Diane BrewsterMiss Canfield

Phyllis CoatesBetty Donaldson

Herb VigranStanley the Barber

William FawcettMr. Johnson

Norman AldenWater Dept. Worker

James GleasonPete

Ken OsmondEddie Haskell

Richard DeaconFred Rutherford

Joanna LeeCourier Sun Classified Advertisement Saleswoman

Tiger FafaraTooey Brown

Doris PackerMrs. Cornelia Rayburn

Shirley MitchellJanet Wilson

Connie GilchristMinerva

John HartTroop #21 Scoutmaster Norton

Raymond HattonCharlie the Fireman

Lyn OsbornNewspaper Customer #2

Frank SullyCab Driver

Lyle TalbotMr. Chuck Dennison

Karl SwensonGeorge Haskell

Edgar BuchananCaptain Jack

Madge KennedyAunt Martha Bronson

Katherine WarrenMrs. Brown

Wendell HolmesMr. T.J. Willet

Burt MustinGus the Fireman

Stanley FafaraWhitey Whitney

Stuart WadeDr. Bradley

Robert 'Rusty' StevensLarry Mondello

Jeri WeilJudy Hensler

Maudie PrickettMrs. Bennett

Ralph SanfordFats Flannaghan

Irving BaconPostal Clerk

Buddy Joe HookerChester Anderson

Rory O'ConnorBeaver (double)

Gary AllenFirst Man

Stephen PaylowBoy #2

Penny CarpenterGirl to see 'Captain Jack'

Wendy WinkelmanViolet Rutherford

Philip GraysonFirst Boy

Julie BennettWaitress

Lonnie ThomasSecond Boy

Tommy BerwaldThird Boy

Benny BakerBarber

Charles H. GrayHarry Donaldson

Yolanda WhiteJulie

John Philip DaytonPanelist

Francis De SalesMr. Anderson

Johnny SilverMan on Bridge

Charles WagenheimPainter

Allen WindsorIce Cream Man

Barbara DoddLibrarian

Louise LewisMiss Higgins

Gil FryeMr. Tyne

Erik NielsenFirst Boy in Library

Paul EngleSecond Boy in Library

Richard SmileyWillie Dennison

Stephen HammerThird Boy in Library

Anne DoreMrs. Wentworth

Helen JayPerfume Customer

Alan ReynoldsSecond Man

Charles DavisWillis 'Corny' Cornelius

Bobby MittelstaedtCharles Fredericks

Eddie MarrWater Dept. Worker

Claudia BryarMrs. Dennison

Patty TurnerLinda Dennison

Dorothy BestFirst Girl at Party

Eric SnowdenSalesman at Abernathy Potts

Betty Lynn BudzakSecond Girl at Party

Helen ParrishGeraldine Rutherford

Frank BankClarence Rutherford

Yvonne WhiteNewspaper Customer

Ray MontgomeryHerb Wilson

Joey ScottBengie Bellamy

Lillian O'MalleyMrs. Whitney

Frank WilcoxDistrict Court Judge

William KendisPolice Officer Charlie

Charles DavisWillis Cornelius

William HuntGrocer

Mary ForanLady in Train Station

Ricky AllenBoy in Train Station

Duke FishmanTrain Station Commuter #2

Bess FlowersTrain Station Commuter #3

Herschel GrahamPassenger

Jan GillumKathleen

Linda LowellFrances

Pamela BairdMary Ellen Rogers

Raymond KarrBoy

Douglas WadeThomas

Dennis HolmesFriend #1

David HalperFriend #2

Jess KirkpatrickGarbage Man

Barry CurtisJohnny Franklin

Ray KelloggMr. Donaldson

GabrielleHelen 'Puddin' Wilson