NASA's Small Business Innovation Research (SBIR) program focuses on technological innovation by investing in development of innovative concepts and technologies to help NASA mission directorates address critical research needs for Agency programs. This report highlights 24 of the innovative SBIR 2015 Phase I projects that emphasize one of NASA Glenn Research Center's six core competencies-Air-Breathing Propulsion. The technologies cover a wide spectrum of applications such as hybrid nanocomposites for efficient aerospace structures; plasma flow control for drag reduction; physics-based aeroanalysis methods for open rotor conceptual designs; vertical lift by series hybrid power; fast pressure-sensitive paint systems for production wind tunnel testing; rugged, compact, and inexpensive airborne fiber sensor interrogators based on monolithic tunable lasers; and high sensitivity semiconductor sensor skins for multi-axis surface pressure characterization. Each featured technology describes an innovation and technical objective and highlights NASA commercial and industrial applications. This report provides an opportunity for NASA engineers, researchers, and program managers to learn how NASA SBIR technologies could help their programs and projects, and lead to collaborations and partnerships between the small SBIR companies and NASA that would benefit both. Nguyen, Hung D. and Steele, Gynelle C. Glenn Research Center AIR BREATHING ENGINES; PROPULSION SYSTEM CONFIGURATIONS; TURBINE ENGINES; AIRCRAFT CONFIGURATIONS; AIRCRAFT STRUCTURES; AIRCRAFT DESIGN; GOVERNMENT/INDUSTRY RELATIONS; NANOCOMPOSITES; LIFTING ROTORS; HYBRID PROPULSION; MAGNETOHYDRODYNAMIC FLOW; TUNABLE LASERS; SENSORS; RESEARCH AND DEVELOPMENT; NASA PROGRAMS