The density, dynamic viscosity, and heat capacity of ammonia + lithium nitrate and ammonia + lithium nitrate + water mixtures were measured between (293.15 and 353.15) K at 1.8 MPa, using a vibrating-tube densimeter, a piston-style viscosimeter, and a heat flux Calvet-type calorimeter, respectively. The measured data were correlated as a function of temperature and composition using simple polynomial equations. Kinematic viscosity data of binary and ternary mixtures were also determined.