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We report the discovery of a debris system associated with the ~30 Myr old G3/5V star HD 12039 using Spitzer Space Telescope observations from 3.6-160 ЮМm. An observed infrared excess (LIR/L*=1У?10-4) above the expected photosphere for ЮЛ>~14 ЮМm is fit by thermally emitting material with a color temperature of T~110 K, warmer than the majority of debris disks identified to date around Sun-like stars. The object is not detected at 70 ЮМm with a 3 Я? upper limit 6 times the expected photospheric flux. The spectrum of the infrared excess can be explained by warm, optically thin material comprised of blackbody-like grains of size >~7 ЮМm that reside in a belt orbiting the star at 4-6 AU. An alternate model dominated by smaller grains, near the blowout size a~0.5 ЮМm, located at 30-40 AU is also possible but requires the dust to have been produced recently, since such small grains will be expelled from the system by radiation pressure in approximately a few times 102 yr.
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