Abstract: A catalyst for ammoxidation of propylene to acrylonitrile, comprisinga) a catalytic composition represented by the following general formula:A.sub.a B.sub.b C.sub.c D.sub.d Na.sub.e Fe.sub.f Bi.sub.g Mo.sub.h O.sub.xwhereinA represents K, Rb, Cs, Tl, or a mixture thereof,B represents Mn, Mg, Sr, Ca, Ba, or a mixture thereof,C represents P, As, B, Sb, Cr, W, V, or a mixture thereof, andD represents one of the following groups:1) Ni alone,2) Co alone,3) Ni and one selected from Li, Pr, Nd, or a mixture thereof,4) Co and one selected from Li, Pr, Nd, or a mixture thereof,5) Ni, Co and one selected from Li, Pr, Nd, or a mixture thereof, anda=0.001.about.2.0,b=0.about.4.5,c=0.01.about.8.0,d=0.01.about.22.0,e=0.01.about.0.7,f=0.01.about.8.0,g=0.01.about.6.0,h=8.about.