A unified model of deformed odd-odd nuclei has been formulated as an aid in nuclear data generation and evaluation. The model employs products of single-particle Nilsson wave functions as basis functions. The coupling of angular momenta of the odd nucleons is assumed to obey the Gallagher-Moszkowski coupling rules. The matrix elements of the proton-neutron residual interaction potential are evaluated with the use of oscillator brackets. The validity of the model has been established by computing and comparing with experimental data nuclear-energy levels and/or gamma-ray transition probabilities for 23Na, 28Al, 166Ho, 182Ta, and 238Np. The calculated results compare quite well with experiment. Special attention has been given to the establishment of an efficient computational method.