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- Accidentals
- Williams African Students Organization
- The Aiki Club
- All Campus Entertainment
- Anchors Away
- Anime Club
- Anti-Gravity Society
- Argentine Tango Club
- Asian Dance Troupe
- Asian Theater Project
- Asian-American Students in Action
- Astronomy Club
- Badminton Club
- Berkshire Symphony
- Best Buddies
- Biology Majors Advisory Committee
- Black Student Union
- Bone Marrow Registry Organization
- Brass Ensemble
- Bridge Club
- Canboulay
- Cap and Bells
- Capoeira
- Ceramics Club
- Chamber Choir
- Chess Club
- Chinese-American Student Organization
- Chocolate Appreciation Society
- Williams Christian Fellowship
- Chinese Yoyo Club
- Cinephiles
- Clarinet Choir
- College Bowl
- College Council
- Combo Za
- Williams Community Building Program
- Williams Competitive Eating Organization
- Competition Cheerleading
- Concert Choir
- Cricket Club
- Culture Counter
- Curling Club
- Cycling Team
- Dance Company
- Dance Dhamaka
- Dancing Folk
- Debate Team
- Democrats@Williams
- Deviants
- Dissonance
- Double Sixes at Williams
- Elizabethans
- Ephlats
- Ephoria
- Equestrian Team
- Essence
- Fencing Club
- Figure Skating Club
- Frosh Council
- Flute Choir
- Forest Garden
- Francophone and Francophile (French) Club
- Free University
- Williams Gaming Alliance
- Gargoyle Society
- Global Education Project
- Good Question
- Gospel Choir
- Grassroots Music
- Graphics
- Greensense
- The Gulielmensian
- Gymnastics Club
- Habitat for Humanity
- Handbell Choir
- Harrison Morgan Brown Pre-Medical Society
- Hawai'i 'Ohana
- House Coordinators
- Independent Horns
- Williams International Club
- International Justice Journal
- Inish
- I-Peers
- Williams Investment Club
- Italian-American Club
- Jazz Ensemble
- Williams College Jewish Association
- Junior Advisor Selection Committee
- Junior Advisors for the Class of 2006
- KAOS: Killing as Organized Sport
- Koreans of Williams
- Kusika
- Lehman Community Service Council
- Literary Review
- Literary Society (Unbound Literary Magazine)
- Mad Cow Humor Society
- (Moocho Macho Moocow Military) Marching Band
- Martial Arts Club
- Meditation Society, Williams
- Minority Coalition
- Minority Association of Pre-Medical Students
- MESS Music Equipment for Serious Students (Rock Bands)
- Museum Associates Program
- Musical Pedagogy Association
- Muslim Student Union
- Nothin' But Cuties
- Octet
- Williams Outing Club
- Peer Health
- Photography Club
- Poppers
- Prizm
- Public Health Alliance
- Purple Bike Coalition
- Purple Valley Films
- Purple Key Society
- Queer Student Union
- Williams College Rape and Sexual Assault Network
- Garfield Republican Club
- WARP or Williams Association of Role Players
- Rotaract Club
- Purple Cow Rowing Club
- Roosevelt Institution
- Rude Cider
- Rugby Football Club
- Run for a Cure
- Sailing Team
- Samulnori Club
- Sankofa
- Scattershot
- Snowboarding Club
- Sol Ka Fe
- Sophomore Council
- South Asian Students Association
- Spanish Club
- Springstreakers
- Springstreeters
- Stanley Kaplan Program in American Foreign Policy
- String/Piano Chamber Music
- Student Alumni Network
- Student Centers Management Team
- Student Global AIDS Campaign
- Student Symphony
- Students for Sensible Drug Policy
- Students for Social Justice
- Students of Caribbean Ancestry
- Students of Mixed Heritage
- Sushi Club
- Swing Club
- Symphonic Winds
- Table Tennis Club
- The Purple Bubble
- The R.O.W.
- Timeline Productions
- Williams Ultimate Frisbee Organization
- Vietnamese Students Association
- Vista
- Voice for Choice
- Williams Club Volleyball
- WARP
- WCFM Williamstown 91.9 FM
- Water Polo Team
- Wiffleball Club
- Williams Catholic
- Williams College Independent Party
- Williams College Model United Nations
- Williams College Tap Ensemble
- Williams Community Building Program
- Women's Center
- Williams Entrepreneurship Society
- Williams Forensics Society
- Williams Literary Circle
- Williams Magic The Gathering Club
- Williams Music Swap
- Williams Percussion Ensemble
- Williams Progressive
- The Williams Record
- Williams Rocket Club
- Williams Students Online
- Williams Trivia
- Williams for Life
- Womens Rugby
- Woodwind Chamber Music
- Writing Workshop
- Youth Vote
- Zambezi Marimba Band