I'll let my "Hogwarts" past shine through:

Prefect in Grade 12
Volleyball
Basketball "colours"
Cross-Country
Track and Field - "colours"
Rowing

Lots of sports and other activities that looked good on the college application, but no one has asked about since then...

Are you kidding? Your school had prefects? What did you get to do??

And if it turns out you were joking, ignore this and try not to laugh.

National Honor Society
Yearbook staff
Spanish Club
Liturgical singer
Retreat Leader
Musical (No, No, Nanette, Annie, Joseph and the Amazing Technicolor Dreamcoat)
Student Variety Show
Illinois State Scholar
Varsity Volleyball
Intramural Volleyball
Homecoming Steering Committee
Mu Alpha Theta

I'm bumping this one, too!

Chamber Choir
Drama - Once on this Island, Odd Couple (female version), Sins of the Mother, Antigone
Gay Straight Alliance - founder and secretary

I was also in the Sons of Norway but that wasn't at school, of course.

ETA: Oh and I worked at Barnes and Noble my senior year.

I'm kind of surprised I didn't post in this thread before. Just because I graduated 26 years ago...

Spanish Club (officer for 3 years)
National Honor Society
Girl Scouts (yeah, in high school, we didn't tell ANYBODY ever!)
Candystriper (volunteering at local hospital, knew it would be a prereq to getting into the med school program I wanted to get into, ended up finding out about Occupational Therapy while helping the Physical Therapists in their area and ended up majoring in OT instead)
Worked 20-30 hours a week from the time I was 16

I had something to do every day of the week, although it doesn't look like much compared to some of these lists!

When I was in high school they needed a student to sign all the checks to pay for stuff for the musicals and plays in my school. They didn't want to have a formal club, so since I was in all the plays and musicals anyway it was me.

The good news was that because I was the only member, not a lot of people knew about it and there wasn't the "drama club geek" distinction.

That and I got to choose the plays and musicals we did. And my budget was a lot bigger than a lot of other clubs, lol.

I swear I was in other clubs and sports teams that had more members than just me.

Yearbook
French Club
Spanish Club
Chorus
Pop Group (aka Show Choir)
All County Chorus
All State Chorus
Band
All County Band
Track and Field
Soccer
Musicals - Joseph and the Amazing Technicolor Dreamcoat (Narrator) Grease (Rizzo)
Plays - Julius Caesar (Portia)
Prom Committee
National Honor Society
JCLA (a Christian theatre troupe)
Lifeguard and Swimming teacher (for elementary kids)

I had two summer jobs, one teaching swimming 15 hours a week and one working as a barback (then a waitress) at an outdoor seasonal bar and grill.

I was a HUGE drama geek in high school. But since my major is theatre, no one should be surprised...

National Merit Scholarship Finalist
-I didn't get the scholarship from the National Merit Corporation, but I still get bragging rights and a fancy scholarship from my university
Beta Club
National Honor Society
EAST Lab- basically, a community service class that uses technology as the mode of service. I'd do video work for various organizations for free. I learned how to use professional grade video cameras and software.
International Thespian Society
-on the cabinet all three years, president my final year
Troubadours (drama club)
Forensics (the theatrical kind, not CSI)
- I had a lot of finalist and third place trophies to my name. I was also a captain of our squad my senior year.
Musicals- Seussical (chorus), Footloose (Wendy Jo)
Plays- Juvie (Carrie), DUI=DOA (Bus Child #2)

DUI=DOA was the most awful play I've ever read...

I was also inducted into a French honor society my senior year, but that wasn't a big deal.

It's interesting to see how many different activities schools have, wow!
I went to a tiny, rural high school so we didn't have a lot of clubs or organizations sadly! I was in:
Drama Club
International Thespian Society (founding member; officer)
Stage Manager for 3 plays
FCCLA (officer)
FBLA
Key Club (officer)
Scholar Bowl
Science Olympiad
NHS
Art Club
I worked 20 hours a week at a fast food place, then one of those phone survey places, then Dollar General.
I graduated a semester early.

Wow, I feel completely worthless compared to many of you...

Softball - 4 years, one year as captain
Golf - 3 years, two years as captain
GAA Intramurals
Spanish Club - 3 years
Social Dance Club - 3 years, one year an officer

That's about it. Does being on the honor roll count? :o

I also worked about 10 hours a week at a marketing consulting firm, where I would type up transcripts of recorded telephone interviews. Sometimes I conducted the interviews. Fun stuff!

-Science Olympiad
-History Club
-Mock Trial team
-Marketing Team/School Bank
-FBLA
-Latin Club
-JCL
-Key CLub
-Honors Biology Environmental Testing Project
-Honors Biology School Beautification Project
-Junior Achievement
-FCA
-School Play (senior year)
-Indoor Soccer
-Softball (only one year I hated it)
-Sophomore, Junior, & Senior homecoming float committee
-Pep Club
-Lunch Bible Study
-Biology/Chemistry TA
-Honors Graduate
-Citizenship Award
-2 Who's Who Among American High School Students

It's been a while, so I'm not sure if I can remember them all.

Latin Club
Symphony Orchestra
All Region Orchestra
All State Orchestra
Flag/Rifle Corps
Cheerleader
Choir
One Act Play
Musical
Speech/Forensics (placed third in state NFL tournament in extemp)
Girl's Service League
Manager, Boy's Cross Country team
History Club
School Newspaper (The Fang)

I went to a small Protestant high school that didn't really have that much in the way of activities.

Dance Team (Captain my senior year)
School Newspaper (Columnist sophomore year, Editorials editor sophomore year, and Managing Editor my senior year)
Managed lax team one semester
Choreographed musicals each year (it wasn't a really big deal except for when we did Carousel my senior year...that ballet took forever)
Painting and Drawing Club
Diversity Club (They needed someone Jewish, so I took a the yearbook photo with them and never went to meetings)
Yearbook

Hmmm...30 years ago for me, but I'll give it my best shot.

National Honor Society-President
Student Council-Social Chair
Student Council-"Outstanding Member"
Yearbook
Quill & Scroll
Rotary Interact
Band-Flag Corps
Young American's Club
Business Club
Announcer's Club
Drama Club
International Thespian Society
Booster Club
Sr. Hall of Fame
Sr. Class "Most Ambitious"
#1/650 graduating class
Who's Who Among American High School Students
National Exchange Club Youth of the Month
HISD Board of Education Award-Most Outstanding Sr. Girl
Mary Gibbs Jones Scholarship recipient

UIL-debate team, extemporous (?) speaking,
One Act Play
Voice of Democracy winner (6th place)
FHA (4 years)
Spanish Club
...That's about it. Small high school and I was the one during a pep rally reading a book. The high school only had 150 kids total.