An efficient base‐catalyzed synthesis of dihydropyrimidines and N‐acetyl pyrazoles is reported using 1‐(2‐aminoethyl)piperazine‐modified nano‐NaY zeolite (ZeSi–AP) under mild and green conditions. The structure of the catalyst was identified by using FT‐IR, XRD, TGA, DTA, DLS, SEM, TEM, and elemental analyses. This heterogeneous catalyst has many benefits, such as a simple work‐up procedure, high product yield, and it is easily regenerated and reused at least for four cycles without losing its activity.