The Mesolithic Storegga tsunami was the largest tsunami in the Northern Atlantic region recorded to date. In this chapter, the impact of the tsunami upon the chronological and spatial distribution of 1041 Mesolithic sites from Western and Central Norway is analysed. The main finding of the analysis is that the taphonomic consequences of the marine Tapes transgression have had such a profound impact upon the Mesolithic archaeological record of this region that it is difficult to draw conclusions about what impact the tsunami had upon Mesolithic site distribution. However, the lack of sites postdating the tsunami in an area especially badly hit by its waves may indicate that people avoided resettling in this area for some time after the event. This is the first time such a human response to the Storegga tsunami event has been potentially identified.