Cosmological models with constant deceleration parameter in Einstein's theory of gravitation in the presence of both the creation of matter and bulk viscosity have been discussed by considering the Universe as an open thermo-dynamical system. We have presented here modified field equations in the presence of particle creation and bulk viscosity. Exact solutions have been obtained for a spatially flat FRW model by keeping the deceleration parameter constant for two different choices of the bulk viscosity coefficient viz., (i) ζ(t) = ζ0 constant and (ii) ζ(t) = ζ0 θ. © 2017 Abdus Salam International Centre for Theoretical Physics.