Let's see:
Bill Daily (Maj. Healey from "I Dream of Jeannie") - his step daughter was my 5th grade teacher and I met him at a school open house.
Gordon Jump (many TV roles including Arthur Carlson on WKRP and the Maytag Repairman) - went to HS with his daughter.
Chris McCarron (all-time leading jockey) - went to elementary school and HS with his daughters. They were friends with my sister for awhile, which lead to a memorable Halloween trick-or-treating in his neighborhood, and meeting the next three on my list:
Vanna White, Wayne Gretzky & Paula Abdul
Jay Leno - came and looked at my dad's car at a car show a couple years ago. Have seen him at several other shows, but that's the only one where I actually "met" him. Heck of a nice, down-to-earth, car guy.
Kevin Costner - his kids went to my HS a couple years ago, and ran into him at a homecoming game. Haley Joel Osmant ("The Sixth Sense") goes there now, but have never met him.
Boris Yaro - (Pulitzer Prize-winning photographer best known for his photo of Bobby Kennedy right after he was shot) - worked at the L.A. Times for a few years and was introduced to him by a co-worker (the three of us then had lunch together).
OK, and this one probably doesn't mean anything to anyone, but he's a "celebrity" in my business - former Undersecretary of Labor John Henshaw (former head of OSHA)
Have seen a lot of other celebrities growing up in L.A., but didn't actually meet any of them. Dudley Moore, George Takei, Erik Estrada, Patrick Duffy, Suzanne Somers, Brian Denehey, Avery Brooks, and probably a few others. Got to see George Bush (the elder) speak at a graduation ceremony back when he was still President, and got to see Gen. John Shalikashvili (former Chairman of the Joint Chiefs of Staff) speak at another graduation ceremony.
Aside from myself, my grandfather went to HS with George Reeves (the original TV Superman), and my parents went to HS with a guy named Kevin Fishburn. Apparently, he didn't think that name would work as an actor, so he changed it to Kevin Tighe sometime before he was on Emergency!