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- Accidentals
- Active Minds
- The Adelphic Union
- The Alexander Hamilton Society
- All Acoustic Alliance
- All Campus Entertainment (ACE)
- Amnesty International
- Anime Club
- Aristocows
- Asian American Students in Action (AASiA)
- Asian Dance Troupe
- Badminton Club
- Berkshire Symphony Orchestra
- Best Buddies
- BFAIR (Berkshire Family & Individual Resources)
- Black Student Union (BSU)
- Brass Ensemble
- Cap and Bells
- Ceramics Club
- Chamber Choir
- Chess Club
- Chinese American Student Organization (CASO)
- College Council (CC)
- Clarinet Choir
- Combo Za
- Commons Club
- Contemporary Dance Ensemble (CoDa)
- Concert Choir
- The Cowbell
- Dance Dhamaka
- Dancing Folk
- Eat It Too
- Elizabethans
- Eph Business Association (EBA)
- Ephineering
- Ephlats
- Ephoria
- Ephs for Israel
- Ephs for Peace in the Middle East
- Equestrian Team
- European Student Association
- The Feast
- Fencing Club
- Figure Skating Club
- Flute Choir
- Francis Lynde Stetson, Class of 1867, Libertarian Club
- Frosh Council
- Frosh Revue
- Garfield Republican Society
- Gargoyle Society
- Get Baked
- Glass Club
- The Globalist
- Good Question
- Gospel Choir
- Guild of Bell Ringers
- The Gulielmensian
- Gusto!
- Habitat for Humanity
- Handbell Ensemble
- Harrison Morgan Brown Pre-Medical Society
- Horizons for Homeless Children
- INISH
- InterFaith
- International Socialist Organization (ISO)
- Jazz Ensemble
- KAOS: Killing as Organized Sport
- Koreans of Williams (KOW)
- Kusika
- Lehman Council
- LIVE: Living in Vincular Experience
- Meditation Society
- Men for Consent (MFC)
- Minority Coalition
- Model United Nations
- Moocho Macho Moocow Military Marching Band
- Muslim Student Association
- Nothin' But Cuties
- Octet
- The Panda
- Peer Health
- Pownal Pen Pals
- PSYK: Psychology Students Yearning for Knowledge
- Purple Bike Coalition (PBC)
- Purple Valley Films
- Queer Student Union (QSU)
- RASAN: Williams College Rape and Sexual Assault Network
- Ritmo Latino
- Rotaract
- Rude Cider
- Sailing Team
- Sankofa
- Ski and Snowboard Club
- Society of the Griffins
- South Asian Students Association (SASA)
- SpeakFree
- Springstreakers
- The Springstreeters
- Storytime
- Student Athlete Advisory Committee (SAAC)
- Student Symphony
- Students for Education Reform
- Students for Justice in Palestine (SJP)
- Students for Sensible Drug Policy (SSDP)
- Students for Social Justice
- Students of Caribbean Ancestry (SoCA)
- Sweet Brook Volunteers
- Symphonic Winds
- Thursday Night Grassroots (TNG)
- Unite for Sight
- Unplugged Gaming Society
- Vietnamese Students Association (VSA)
- Vista
- WARP: Williams Association of Role Players
- WCFM Williamstown (91.9 FM)
- Williams African Students Organization (WASO)
- Williams at Berkshire Farm Center
- Williams Water Polo Team
- Williams Catholic
- Williams Christian Fellowship (WCF)
- Williams College Bowl
- Williams College Debating Union (WCDU)
- Williams College Democrats
- Williams College Go Club
- Williams College International Investment Group
- Williams College Jewish Association (WCJA)
- Williams College Law Society
- Williams College Women's Center
- Williams Club Volleyball
- Williams Cycling Team
- Williams Exploration Team
- Williams for Life
- Williams Immediate Theatre
- Williams International Club (IC)
- Williams Literary Review
- Williams Magic: The Gathering Club
- Williams Men's Rugby Football Club (WRFC)
- Williams Men's Water Polo
- Williams Outing Club
- Williams Percussion Ensemble
- Williams Photography Club
- Williams Photography Journal
- Williams Pre-Medical Journal Club
- The Williams Record
- Williams Secular Community (WSC)
- Williams Soccer League (WSL)
- Williams Speaks
- Williams Students Online
- Williams Sustainable Growers (WSG)
- Williams Telos
- Williams Trivia
- Williams Triathlon Club
- Williams Ultimate Frisbee Organization (WUFO)
- Williams Women in the Sciences (WWitS)
- Williams Women's Water Polo
- Williams Women's Rugby Football Club (WWRFC)
- WISHES: Williamstown Elementary in the Spring
- Woodwind Chamber Music
- Women of Color Resource Center (WCRC)
- WRAPS: Williams Recovery of All Perishable Surplus
- Wushu
- Zambezi Marimba Band