A couple of CEOs, some pro athletes and a former Mayor of Dallas.
I should add myself to the list.
Boy, you guys had a whole bunch of 'em!
I graduated from Groveton HS, in Fairfax County, just south of Alexandria. It no longer exists as such, having been subsumed into what is now West Potomac HS.
If we had any notable celebs among our alumni, I’m blissfully unaware of it. A good number of quite accomplished people, but nobody who’s very famous outside of their profession. A girl in the class behind me was briefly a state legislator in Wisconsin - not exactly heady stuff, there.
I graduated from Loyola High School in Towson, MD. Author Tom Clancy and sports announcer Jim McKay are the most famous alumni.
The school has since changed its name to the snootier Loyola Blakefield.
Chris T. Sullivan, Outback Steakhouse founder
Steve Francis, NBA player
Carl Bernstein, journalist
Connie Chung, broadcast journalist
Nora Roberts, romance novelist
Goldie Hawn, actress
Ben Stein, nutjob
My high school’s most famous alumnus is Gary Busey.
My kids’ high school, on the other hand, has dozens of famous alumni: Jeff Bridges, Danny Elfman, Judy Garland, Roddy McDowell, Marilyn Monroe, Ryan O’Neal, Herb Ritts, Nancy Sinatra, Elizabeth Taylor, etc.
Robin Williams, and “American Taliban” John Walker Lindh.
The most prominent ones are NHL players, such as Tom Barrasso, Bob Brooke, and Tom Sweeney. Also Carroll Spinney, who performs Big Bird on Sesame Street
I went to Abbot Pennings High School, a small all-boys Catholic school in De Pere, WI (outside of Green Bay). The school closed in 1990, when it (and the two other Catholic high schools in the area) were consolidated into one school. I was at the very end of the Baby Boom (graduated in '83), and, at that point, we typically had 75 or so guys in each graduating class; by the time the school was closed, class sizes were about half of that.
As such a small school, I’m not surprised that no one of wide fame graduated from APHS, as far as I know. The closest we had were:
Kevin Rankin (class of 1990, the final graduating class) – he was an academic All-American basketball player at Northwestern, held a number of school records, and played professionally in Europe and the Middle East for a long while.
Charles Hoslet (class of 1982) – executive with the University of Wisconsin, and former legal counsel for the governor of Wisconsin. He was a year ahead of me; I suspect that no one calls him “Bullethead” anymore. 
Grant HS, Portland, Oregon: Class of 1965, Sally Struthers - she was a cheerleader. Same class, I think, or possibly the previous year, jazz musician Tom Grant. He was already playing in a combo, and entertained us in assembly once. That’s all I know about, but there may have been some since I graduated (1967).
The most famous alumni of my high school are probably…
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Author/journalist Pete Hamill, though he didn’t graduate and often trashes the old school.
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Dr. Anthony Fauci, immunologist and AIDS expert
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Gene Orza, high official of the baseball players’ union
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Bill Condon, Hollywood director and screenwriter (possibly best known for Gods and Monsters)
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Lou DiBella, boxing coordinator at HBO
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Eugene Maleska, longtime crossword editor of the NY Times
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Robert Giroux, publishing magnate
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John Leo, political columnist at US News
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John McGiver, comical character actor (the quintessential “I don’t know your name, but I know I’ve seen you in a hundred things!” guy)
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Mike “King Wally” Walczewski, announcer at Madison Square Garden for all Knicks and Rangers games
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Colin Jost, writer and Weekend Update host for Saturday Night Live
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Regis Philbin’s dad, who named his son after the old school.
Of this group, the only ones I knew were Lou DiBella (who was a year ahead of me) and Mike Walczewski, whose brother was a classmate of mine.
Dodge City, KS Senior High. I don’t know anything about any of them aside from what Wikipedia says:
Dale Burnett, former NFL running back with the New York Giants
Robert Delpino, former NFL running back with the Los Angeles Rams and Denver Broncos
Fred Hall, 33rd Governor of Kansas from 1955 to 1957
Dennis Hopper was born there, but his family moved before he was high school age.
Our fictional characters from Gunsmoke are more famous than anyone who actually came from there!
A good number of famous names along with a few infamous ones, too. The list skews heavily towards show business and music industry celebrities. Two of the latter with particular meaning to me are John Densmore and Robbie Krieger of the Doors. Due to the school’s attendance area, covering a wide swath of hillside neighborhoods where many of the famous settled after they made it, there are a few second-generation celebs in the list.
Since I last posted in this thread in 2009, another guy is now kinda famous - Andy Cohen, from What What Happens Live. I already knew the other famous people while they were trying to get famous, but seeing him completely took me by surprise.
It’s a strange thing when you see some random TV promo and get to say “I went to High School with that guy!”
My school, nobody I’m aware of. My wife’s school, Edward Norton. My sons’ school, Goldie Hawn. I think Ben Stein and Robert Woodward graduated from their school as well.
Yes, I know that this post is six years old, but the little green light tells me that TheChileanBlob is still around and active, so in hopes he or she’ll see this:
Holy walk down memory lane, Batman! I know what high school you attended; I went to the one that used to be y’all’s archrival, until the county merged them and mine became a middle school. The annual DHS/PHS game was Serious Business in our community.
I saw Billy Ray play valiantly but get beaten by the Patriots in my senior year; it was the most exciting football game I’ve ever seen.
I can’t find any list of notable alumni from my high school, alas. But I had some *very very * intelligent friends, one of whom I just discovered is a partner in a law firm in North Carolina and a professor at the UNC School of Law. So he might be it.
Huh, I got it wrong about Woodward. I wasn’t that far off, though. I guess you went when it was at the old location? Wait, it’s been around 20 years since they moved now. I remember when my wife and I were dating we came down from NY to have Thanksgiving with her family. Her cousin pointed out the new school. Little did we know we’d get married, move to the DC area, and send our sons to that school.
I graduated in '95. I believe '98 was the last class to graduate from the old building.
Didn’t know any of them, but:
Julian Bond
Ennis Cosby
Blythe Danner
Keir Dullea
George Segal
Stephen Sondheim
Astronaut Deke Slayton. And absolutely no one else of note.
Malvern College: it could be either of two Nobel laureates, Francis William Aston and James Meade, Jeremy Paxman, or Aleister Crowley; it’s probably CS Lewis, though. I went at the same time as David Nash and knew him in passing, but I doubt anyone other than fans of English cricket would recognize the name. We also had a prime minister of Malaysia.
Merritt Island High School (where I actually graduated from): Clint Hurdle (baseball player and current Pittsburgh Pirates manager) and Will Perdue (one of Michael Jordan’s teammates) are the only people on the Wikipedia page I’ve heard of.