Compositions for reduction of NO.sub.x generated during a catalytic cracking process, preferably, a fluid catalytic cracking process, are disclosed. The compositions comprise a fluid catalytic cracking catalyst composition, preferably containing a Y-type zeolite, and a particulate NO.sub.x composition containing particles of a zeolite having a pore size ranging from about 3 to about 7.2 Angstoms and a SiO.sub.2 to Al.sub.2O.sub.3 molar ratio of less than about 500. Preferably, the NO.sub.x reduction composition contains NO.sub.x reduction zeolite particles bound with an inorganic binder. In the alternative, the NO.sub.x reduction zeolite particles are incorporated into the cracking catalyst as an integral component of the catalyst. Compositions in accordance with the invention are very effective for the reduction of NO.sub.x emissions released from the regenerator of a fluid catalytic cracking unit operating under FCC process conditions without a substantial change in conversion or yield of cracked products, e.g., gasoline and light olefins. Processes for the use of the compositions are also disclosed.