Alumina slurries with three different levels of ammonium polyacrylate (Darvan 821 A) and dibasic ammonium citrate (DBAC) dispersants-lower than optimum, optimum, and higher than optimum-were chosen for investigation. The nature and amount of dispersants had a significant influence on viscosity and time-dependent behavior of freshly prepared and aged slurries. All slurries were subjected to static and dynamic aging treatments. All slurries were pseudoplastic in behavior, with the non-Newtonian index (n) being maximum for optimum amount of each of the dispersants. For freshly prepared slurries, hysteresis was the least for optimum amount and maximum for slurries with less than optimum amount of Darvan and DBAC dispersants. Slurries with below optimum amount of dispersant exhibited greatest aging. DBAC-based slurries experienced a greater percentage increase in viscosity than Darvan-based slurries during static aging. Biodegradability of DBAC contributed to aging of the DBAC-based slurries. All slurries, except the one with below optimum amount of DBAC, exhibited a decrease in viscosity after 48 h of dynamic aging. Static aging influenced the thixotropic behavior of slurries while dynamic aging had a minimal effect.