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This List of Germantown Academy people catalogs notable alumni of Germantown Academy, a private school in Philadelphia, Pennsylvania.

• Kyle Garland (Class of 2018), professional decathlete who competed for the United States in the 2023 World Athletics Championships
• Sierra Schmidt (Attended from 2010-2015), competitive freestyle swimmer, competitor and record setter in the 800m freestyle event of the 2015 Pan American Games
• Dan Lovitz (Class of 2010), professional soccer player, currently plays for Nashville SC in Major League Soccer, 13 appearances for the United States national team in 2019.
• Cameron Ayers (Class of 2010), professional basketball player who currently plays for the Reno Bighorns of the NBA Development League. 2014 graduate of (Bucknell University)
• Maggie Lucas (Class of 2010), professional women's basketball player, currently plays for the (Indiana Fever), two-time Big 10 Player of the Year at (Penn State University)^[1]
• Jen Hoy (Class of 2009), professional women's soccer player, currently plays for the (Chicago Red Stars), member of the U-23 Women's World Cup team (Princeton University)
• Caroline Doty (Class of 2008), basketball player (University of Connecticut Huskies)
• Fran Crippen (Class of 2002), US National Team Swimmer. 6 Time National Champion.
• Matt Walsh (Class of 2002), NBA basketball player (New Jersey Nets); played for University of Florida Gators
• Jarrod Spector (Class of 1999), Tony Award nominee for his performance in Beautiful: The Carole King Musical.^[2]
• Maddy Crippen (Class of 1998), United States 2000 Summer Olympics swim team, 3 time National Champion
• Bradley Cooper (Class of 1993), Oscar-nominated film and TV actor (Sex and the City, Alias, Wedding Crashers, Wet Hot American Summer, The Hangover, and Silver Linings Playbook)
• Brian Klugman (Class of 1993), film and TV actor, scriptwriter (Psych, Tron: Legacy)
• Alvin Williams (Class of 1993), NBA basketball player (Toronto Raptors) and sports commentator (Comcast SportsNet)
• Michael F. Gerber (Class of 1990), Pennsylvania State Representative
• Deirdre Quinn (Class of 1989), actress (Miss Congeniality, The Diary of Ellen Rimbauer (film), Heroes)
• Trina Radke (Class of 1989), Olympic Swimmer, 1988 Olympics, USA National Champion, American Record Holder, and U.S. Team Captain.
• David Wharton (Class of 1987), Olympic silver medalist (Seoul, 1988) in the 200 m swimming Individual Medley
• Mike Richter (Class of 1985), New York Rangers goaltender
• Randolph Cohen (Class of 1983), financial economist, associate professor at the MIT Sloan School of Management
• Eric Lipton (Class of 1983), Pulitzer Prize-winning journalist and author, currently with the New York Times
• Brian L. Roberts (Class of 1977), CEO of Comcast
• Timothy Stack (Class of 1974), actor, writer and producer (Parker Lewis Can't Lose, Son of the Beach, My Name is Earl)
• Eric Minkin (Class of 1968), American-Israeli basketball player
• Edward Piszek Trustee, co-founder of Mrs. Paul's Kitchens
• Martin "Cruz" (William) Smith (Class of 1960), novelist (Gorky Park)
• Frederick Crews, literary critic, University of California, Berkeley professor, and noted anti-Freudian scholar^[3]
• Bill Tilden (Class of 1910), professional tennis player
• Charles Darrow (Class of 1907), claimed inventor of Monopoly board game
• George Washington Hill (Class of 1899, didn't graduate), President of American Tobacco Company 1925-1946
• Charles Day (Class of 1895), consulting engineer and co-founder of Day & Zimmermann
• Owen Josephus Roberts (Class of 1891), associate justice of the United States Supreme Court
• Thomas Sovereign Gates (Class of 1889), University of Pennsylvania president
• Howard Henry (Class of 1889), All-American halfback for the 1903 Princeton Tigers football team, U.S. Army captain
• James DeWolf Perry (Class of 1887), 7th Bishop of Rhode Island, Presiding Bishop of the Episcopal Church (1930-1937)
• Witmer Stone (Class of 1883), ornithologist, botanist, mammalogist
• Frederick Winslow Taylor (did not graduate), efficiency expert; inventor of Scientific Management
• Owen Wister (Class of 1878, but did not graduate), author of The Virginian and other classics of Western fiction
• Alfred C. Harmer (Class of 1843), U.S. congressman and shoe manufacturer
• Robert Montgomery Bird (Class of 1824), physician; playwright
• Sidney George Fisher (Class of c. 1820), noted diarist, lawyer, orator, and gentleman
• George Washington Parke Custis (attended 1790s), step-grandson and adopted son of President George Washington
• Hilary Baker (attended 1760s), mayor of Philadelphia (1796-1798), son of Headmaster Hilarius Becker