This chapter presents important experimental and numerical findings regarding the dynamics of gravity currents in various stratified environments. First, the macro-and microstructure of gravity currents descending an inclined bed in linearly stratified environments were studied using high-speed camcorders and particle image velocimetry technology. Results indicate that the dynamics of gravity current are complicated by ambient stratification. Two equations with three fitted parameters from experimental data were proposed to predict the velocity profiles of gravity current. Secondly, gravity currents released from two-layer stratified locks were also experimentally studied, with emphasis on the effect of the initial height ratio (ℎ 𝑅) and lock aspect ratio (𝑅 𝑙) on the mixing process. Analysis reveals the importance of ℎ 𝑅 and 𝑅 𝑙 in determining the front velocity and mixing process within the gravity current. Finally, the dynamics of turbidity currents in linearly stratified environments were numerically simulated with the aim of elucidating the effects of ambient stratification, bed slope, and particle settling velocity on the evolution process of the currents. The study demonstrates that if the relative stratification parameter (i.e., 𝑆𝑟 = 𝜌 ̂𝐵 − 𝜌 ̂𝑆/𝜌 ̂𝐿 − 𝜌 ̂𝑆) is greater than unity (i.e., 𝑆𝑟 > 1), the head of the current would separate from the slope and intrude into the environment at the level of neutral buoyancy. Strong ambient stratification reduces the rate at which potential energy is converted to kinetic energy, while a higher particle settling velocity accelerates the rate at which kinetic energy is dissipated. We conclude that the velocity and fluid structure of gravity currents can be complicated by ambient stratification and present a theoretical model that accurately predicts the separation depth of turbidity currents in density-stratified environments.