Frank Armstrong

Frank Armstrong may refer to:
 * Frank Crawford Armstrong (1835–1909), Confederate general during the American Civil War
 * Frank P. Armstrong (c. 1859–1923), Canadian steamboat captain
 * Frank Jeremiah Armstrong (c. 1877–1946), American physician
 * Frank A. Armstrong (1902–1969), United States Air Force general
 * Frankie Armstrong (born 1941), English singer and voice coach
 * Frank Armstrong III (born 1944), American financial advisor