Kit Armstrong (born March 5, 1992) is an American classical pianist, composer, and former child prodigy of British-Taiwanese parentage.

Armstrong was born in Los Angeles into a non-musical family. He displayed interest in sciences, languages and mathematics. At the age of 5, and without access to a piano, he taught himself musical composition by reading an abridged encyclopedia. He subsequently started formal studies in piano with Mark Sullivan and in composition with Michael Martin (1997–2001). Armstrong has always pursued music and academic education in parallel. He attended Garden Grove Christian School (1997–1998), Anaheim Discovery Christian School (1998–1999), Los Alamitos High School and Orange County School of the Arts (1999–2001). While in high school, he studied physics at California State University, Long Beach, and music composition at Chapman University. At the age of 9, he became a full-time undergraduate student at Utah State University studying biology, physics, mathematics as well as music (2001–2002). In 2003, Armstrong enrolled at the Curtis Institute of Music studying piano with Eleanor Sokoloff and Claude Frank, while simultaneously taking courses in chemistry and mathematics at the University of Pennsylvania. In 2004, Armstrong moved to London to continue his music education at the Royal Academy of Music studying piano with Benjamin Kaplan, composition with Paul Patterson, Christopher Brown and Gary Carpenter, and musicianship classes with Julian Perkins. In parallel, he studied pure mathematics at the Imperial College London (2004–2008). Armstrong received a Bachelor of Music degree with First Class Honours from the Royal Academy of Music in 2008 and a Master of Science degree with honours from Pierre-and-Marie-Curie University, Paris, in mathematics in 2012. Armstrong has studied regularly with Alfred Brendel since 2005.