In the title compound, C(19)H(20)N(2)O, the dihedral angles between the 1,3,4-oxadiazole ring and the pendant 4-tert-butyl-phenyl and 4-methyl-phenyl rings are 12.53 (17) and 2.14 (17)°, respectively. In the crystal, mol-ecules are linked by C-H⋯N hydrogen bonds, forming chains.