Tidal processes are a significant driver of coastal and shelf ecosystems, impacting the timing and magnitude of storm surge and sea level extremes, the strength and persistence of shallow currents and mixing dynamics, as well as the transport of sediment, salt, and biogeochemical constituents. While changes in tides due to astronomical effects are well understood, shifts associated with a changing climate remain relatively unexplored. In this work, we employ high resolution global-to-regional modelling to quantify the impact of various climate driven changes to tidal amplitudes and circulation. Mechanisms associated with changing sea levels, polar ice-shelf geometry and ocean stratification are examined in detail, with a focus on understanding the drivers and magnitude of change in the Southern Ocean and in Australia’s shelf and coastal regions.