Dynamical DMRG (DDMRG) is a program for analyzing the dynamical properties of one-and two-dimensional quantum lattice models for strongly correlated electron systems (e.g. Hubbard model) and quantum spin systems (e.g. Heinseberg model) by using the density matrix renormalization group method. DDMRG can be applied for the calculation of the dynamical spin and charge structure factors, optical conductivity, nonlinear optical responses, and time-dependent nonequilibrium responses. It is also possible to include electron-phonon interactions. DDMRG is compatible with large scale parallel computing and it enables us to study state-of-the-art quantum dynamics by setting simple input files.