|Head of School||Bernie Noe|
|Number of students||776|
|School color(s)||Maroon, Gold|
Lakeside School was founded in 1919 by Frank G. Moran as Moran-Lakeside School on the shores of Lake Washington in the Denny-Blaine neighborhood of Seattle. In 1923 the school was incorporated and renamed to Lakeside Day School. In 1923, it moved to the present site of The Bush School in Washington Park. In 1930, Lakeside moved to its newly constructed campus at its current location. It became coeducational upon merger with St. Nicholas, a Capitol Hill girls' school, in 1971.
Lakeside sends 100% of its graduating class to four-year colleges.
Global Service Learning
Established in the summer of 2005, the school's Global Service Learning Program aims at helping students gain a broader view of the world while helping the underprivileged around the world. In 2005, students visited India, Peru, and China; in the summer of 2006 students travelled to Peru, China, Morocco, and the Dominican Republic. In the summer of 2007, 86 Upper School students traveled to Peru, China, Morocco, India, and the Dominican Republic. This list grew to include Senegal as an option for the 2009 summer trips (removed in 2015 due to the Ebola virus epidemic in West Africa), Ecuador for the 2013 summer trips, Thailand for 2014, and the Dominican Republic for 2015. The Middle School opened its first Global Service Learning Program for seventh graders with trips to the Makah Indian Reservation on Neah Bay in the summer of 2006; it has sent an eighth grade trip to Costa Rica every summer since 2007. It also began a trip for sixth graders to Broetje Orchards in the summer of 2010.
The Global Service Learning Program is one piece of a broad change in curriculum and administrative policies aimed at increasing diversity. The school has focused on, in recent years, its role as an elite prep school and its desire for diverse viewpoints and backgrounds of its curriculum, faculty, and students.
Lakeside students have the opportunity to study abroad during their junior year of high school through schools called School Year Abroad, the Mountain School, the Rocky Mountain Semester, the Maine Coast Semester, and CityTerm. Students may apply in the winter of their sophomore year to spend part of their junior year at one of these schools.
Lakeside has a long tradition in engaging students in global affairs. In 1984, Lakeside students competed against students at Moscow School #20 in a chess match relayed by Telex. The event was one of the first of its kind. A yearly exchange program with Moscow School #20 began in 1986, the first such regular American-Soviet school exchange in the country. Since 1984, the schools have been sister schools.
Lakeside has many student-led clubs and affinity groups such as the Acafellas and the Bellas (a cappella programs), Black Student Union, Student Awareness Council, GLOW (Gay Lesbian Or Whatever, a Gay Straight Alliance club), MIxED (Multicultural Initiators EXperiencing and Encouraging Diversity), Lakeside Asian-Pacific Students, C Se Puede (a support network for Latin American students), Gardening club, Knowledge Bowl, Tatler (the school newspaper), and Ultimate Frisbee, to name a few. The number and nature of clubs changes each year as student interests change. 
A large athletics program offers golf, football, soccer, volleyball, crew, wrestling, baseball, basketball, tennis, swimming, diving, lacrosse, cross country, and track and field as well as a strength and conditioning program.  The 2013-2014 boy's soccer team won the WIAA state championship in the 3A division.  The 2014-2015 girl's swim team won the 3A WIAA state championship for the first time in school history.
- Charles Pigott (class of 1947, Chairman and CEO of PACCAR 1967-1996 
- Frederic Moll (class of 1969), co-founder of Intuitive Surgical, Hansen Medical and Mako Surgical
- Jabe Blumenthal (class of 1978), designer of Microsoft Excel
- Maria Eitel (class of 1980), first president of the Nike Foundation
- Tor Seidler, author of "A Rat's Tale", "Mean Margaret" and "Gully's Travels"
- Daniel Kan - Co-Founder, Exec (errand service).
- "The Gift That Keeps on Giving". Lakeside School. Retrieved 2012-09-29.
- "Lakeside School ~ School History". Lakesideschool.org. 1910-01-11. Retrieved 2013-02-25.
- "Lakeside at a Glance". Lakeside School. Retrieved 2010-09-25.
- "Lakeside School ~ Global Service Learning". Lakesideschool.org. Retrieved 2013-02-25.
- "School Life- Student Clubs". lakesideschool.org. Retrieved 2014-07-15.
- "Athletics- Teams". lakesideschool.org. Retrieved 2014-07-15.
- "Champions: Boys Soccer Wins First WIAA State Crown". lakesideschool.org. Retrieved 2014-07-15.
- Feder, Barnaby J. (2008-05-04). "Prepping Robots to Perform Surgery". The New York Times.
- "High-tech investment helps wildlife". USA Today. 2001-01-24. Retrieved 2010-05-07.
- Lim, Paul J. (1995-08-15). "Microsoft Alums Just Starting To Make Their Mark". The Seattle Times.
- Maria Eitel, Huffington Post, 2013, retrieved 2013-05-11
- Maria Eitel (speaker) (2013-05-09). 2013 Distinguished Alumni Award: Maria Solandros Eitel '80 (Vimeo). Seattle: Lakeside School.
- The New York Times http://www.nytimes.com/books/97/11/16/reviews/971116.16dunleat.html. Missing or empty
- Geron, Tomio (2012-02-29). "Justin Kan Launches Exec For Real-Time Mobile Jobs". Forbes.