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We report the discovery of six infrared stellar-wind bowshocks in theGalactic massive star formation regions M17 and RCW49 from Spitzer GLIMPSE(Galactic Legacy Infrared Mid-Plane Survey Extraordinaire) images. The InfraRedArray Camera (IRAC) on the Spitzer Space Telescope clearly resolves thearc-shaped emission produced by the bowshocks. We combine Two Micron All-SkySurvey (2MASS), Spitzer, MSX, and IRAS observations to obtain the spectralenergy distributions (SEDs) of the bowshocks and their individual drivingstars. We use the stellar SEDs to estimate the spectral types of the threenewly-identified O stars in RCW49 and one previously undiscovered O star inM17. One of the bowshocks in RCW49 reveals the presence of a large-scale flowof gas escaping the H II region at a few 10^2 km/s. Radiation-transfer modelingof the steep rise in the SED of this bowshock toward longer mid-infraredwavelengths indicates that the emission is coming principally from dust heatedby the star driving the shock. The other 5 bowshocks occur where the stellarwinds of O stars sweep up dust in the expanding H II regions.

Interstellar Weather Vanes: GLIMPSE Mid-Infrared Stellar-Wind Bowshocks in M17 and RCW49