This publication's first objective is to convey detailed information regarding the designers and design process for the emblems of NASA and its predecessor, the National Advisory Committee for Aeronautics (NACA). The second objective is to briefly illustrate the applications of these respected and admired insignias and seals within the cultures of each agency. For this task, photographs and descriptions are used to exemplify applications to buildings, equipment, aircraft and spacecraft, correspondence and documents, and personal memorabilia such as pins, awards, and retirement plaques. The material presented herein is organized chronologically and covers the subject from the first days of the NACA in 1915 to the current-day situation in NASA.