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We detect significant $\\gamma$-ray emission associated with the remnant: the flux >100 MeV is $9.4\\pm0.8(stat)\\pm1.6(syst)\\times10^{-11}$ erg cm$^{-2}$ s$^{-1}$. HB 21 is well modeled by a uniform disk centered at $l= 88{\\deg}.75\\pm 0{\\deg}.04$, $b = +4{\\deg}.65 \\pm 0{\\deg}.06$ with a radius of $1{\\deg}.19 \\pm 0{\\deg}.06$. The $\\gamma$-ray spectrum shows clear evidence of curvature, suggesting a cutoff or break in the underlying particle population at an energy of a few GeV. 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