KAg(NO3)2 crystallizes in space group P21/a-C2h5,a=13.953,b=4.955,c=8.220 A, β=97.76°,Z=4. X-ray intensities were collected with a two-circle diffractometer. The structure was solved by means of direct methods andFourier syntheses and was refined by the least squares method toR=0.034 with 1346 observed reflexions.∞1{Ag2(NO3)4}2−-chains run parallel toy and are linked by potassium ions. Ag shows a distorted tetrahedral coordination with four relatively close O. K is irregularily surrounded by ten O. The isotypic compounds NH4Ag(NO3)2 and RbAg(NO3)2 were refined toR=0.032 and 0.035, respectively. The coordination figures are compareable with those in KAg(NO3)2.