The Westminster School is a private, coeducational college-preparatory, boarding and day school located in Simsbury, Connecticut, United States, accepting around 20% of applicants. The total student population is approximately 400, and includes pupils from 25 US states and 30 countries. It is also a member of the Founders League, an athletic league comprising ten college preparatory boarding schools in Connecticut and one in New York.

Westminster School was founded in 1888 as a boys' school by William Lee Cushing, a graduate of Yale University. Girls were first admitted to the school in 1971. Like many boarding schools, Westminster faced difficult times in the 1970s as it competed for a shrinking pool of boarding students. When Donald Werner retired in 1993, after serving as Headmaster for 21 years, he was succeeded by Graham Cole.

Significant building projects undertaken include:

• Edge House. Designed by Westminster alumnus Graham Gund and built in 1996, Edge House houses 33 students and three faculty families.

• Kohn Squash Pavilion. Completed in the Spring of 2000, The Squash Pavilion contains eight squash courts around a stepped viewing area with natural light from skylights above. The team rooms, locker rooms, and other support spaces are located on a second floor mezzanine overlooking the viewing area and squash courts below.
• Sherwin Health & Athletic Center. Completed in 2003, the Sherwin Health & Athletic Center, the Hibbard Aquatic Center and the Health & Counseling Center is a multipurpose building. The Aquatic Center contains an eight lane competition pool with support facilities and a viewing area on the mezzanine floor.
• Armour Academic Center. This 85,000-square-foot Center houses the Humanities, Math and Science departments, library, and administration. Building features include a centrally located atrium, two-story library, classrooms and laboratories, 120-seat lecture hall, planetarium, faculty and administrative offices, and a variety of lounge spaces.

With Cole's retirement in 2010, Westminster appointed William V.N. Philip as its eighth Headmaster. Philip ascended to the top job after a 26-year career at Westminster as a teacher, coach, dormitory parent, college counselor, and Associate and Assistant Headmaster. Philip stepped down at the end of the 2020–21 academic year.

Elaine B. White was appointed the ninth Head of School in 2021. Prior to her arrival at Westminster, Elaine was Associate Head of School at The Governor's Academy.

• 1988-1920: William Lee Cushing
• 1920-1922: Lemuel Gardner Pette
• 1922-1936: Raymond McOrmond
• 1936-1956: Arthur Milliken
• 1956-1970: Francis Keyes
• 1970-1993: Donald H. Werner
• 1993-2010: W. Graham Cole Jr.
• 2010–2021: William V.N. Philip
• 2021–Present: Elaine B. White

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Sport	Season	Boys/Girls	Competitive	Practice and Game Facilities
Cross Country	Fall	B/G	Yes	Campus trails
Field Hockey	Fall	G	Yes	Hovey Field (lighted turf) and Sawyer Field
Soccer	Fall	B/G	Yes	Harrison, Michelini, Wilbraham and Tate Fields
Water Polo	Fall	B	Yes	Hibbard Aquatic Center
Basketball	Winter	B/G	Yes	Pettee and New Gymnasiums
Ice Hockey	Winter	B/G	Yes	Jackson Hockey Rink
Squash	Winter	B/G	Yes	Kohn Squash Pavilion
Swimming and Diving	Winter	B/G	Yes	Hibbard Aquatic Center
Baseball	Spring	B	Yes	Osborn Baseball Field
Golf	Spring	B/G	Yes	Hopmeadow Country Club and Simsbury Farms Golf Course
Lacrosse	Spring	B/G	Yes	Hovey Field (lighted turf), Harrison and Wilbraham Fields
Softball	Spring	G	Yes	Softball Field and Observatory Field
Tennis	Spring	B/G	Yes	Briggs, Gow and Haynes Tennis Courts
Track and Field	Spring	B/G	Yes	Brooks Family Track

Each year the theater program stages three productions in the Werner Centennial Theater: one dramatic production spanning the varied genre of Western theater, a musical production, and the student-directed performances, which offer advanced students the opportunity to direct. Each of these productions offers many opportunities for student involvement and leadership, both on stage and backstage.

Situated at the northeastern corner of the campus's central quadrangle, Centennial Center was upgraded in 1988 into a 30,000 square-foot building including a two-story lobby, a 400-seat, multi-use Shakespearean-style theater, music and dance studios and rehearsal room, dressing rooms, a scene shop/laboratory and other production support spaces. Particular to the “courtyard” theater form, all 400 seats are within 40 feet of the front of the stage, and there is built-in flexibility for both audience size and style of production.

This article's list of alumni may not follow Wikipedia's verifiability policy. Please improve this article by removing names that do not have independent reliable sources showing they merit inclusion in this article AND are alumni, or by incorporating the relevant publications into the body of the article through appropriate citations. (August 2022)

• William Acquavella, art dealer, head of Acquavella Galleries
• Lake Bell '97, actress
• Eric Boguniecki, NHL hockey player
• Ethan Brooks '91, NFL football player
• Joy Bryant '92, actress
• William S. Beinecke, ‘32, Namesake of Yale University's Beinecke Rare Book and Manuscript Library
• Tommy Cross '08, Boston Bruins 2nd round draft pick and currently with the Columbus Blue Jackets
• David Doubilet '65, National Geographic photographer
• Jack Du Brul, writer
• Patrick Ellis, radio personality
• Andrew Firestone '94, The Bachelor TV series
• Peter Fonda, actor
• Bryan Nash Gill, '80, artist
• Graham Gund '59, architect
• Bertil Hille
• John William Kilbreth, 1894, U.S. Army brigadier general
• Alec Musser, actor
• Ben Smith '06, NHL Hockey player
• John V. Tunney '52, former United States Senator and Representative from the state of California
• Wellesley Wild '90, writer and executive producer of Family Guy

• Official website

41°53′13″N 72°47′48″W / 41.8869°N 72.7968°W / 41.8869; -72.7968